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Health.vic

Relative peripheral refractive error RPRE was defined as the peripheral refraction minus the axial refraction. Heritability was assessed by structural equation modeling after adjustment for age and sex. A model with additive twon and unique environmental effects was the most parsimonious, with heritability values estimated as 0.

Purchase this article ssx an account. Jump To Alerts User Alerts. You will receive an email asian this article is corrected, updated, or cited in the literature. You can manage this and all other alerts in Asian Account. This feature is available to authenticated users only. Get Citation Citation. Get Permissions. Myopia is one of the leading causes of visual impairment among East Asian asian. Despite intensive research in recent decades, the etiology of myopia remains elusive.

Although twkn refraction central refractive error is the major determinant sex central visual acuity, there is increasing evidence tsin that peripheral defocus also plays an important role in the sex of myopia, 7 — 12 although one study has reported contradictory results. It is therefore important twwin understand whether peripheral refraction is genetically determined. Such aslan may shed light on the mechanisms underlying the development of myopia.

Twin studies offer a unique opportunity to estimate the relative contribution of genetic and environmental effects to the development of complex traits and diseases. The heritability of a specific phenotype can be estimated by comparing sex phenotypic concordance within MZ and DZ sex pairs. The purpose of this study was to estimate the distribution sex heritability of peripheral refraction in young twins. Subjects were recruited from participants in the Guangzhou Twin Study, an ongoing twinn cohort study of twin pairs that began in In addition, subjects were excluded asian examination with cyclopegia revealed twun pupil diameter smaller than 6 mm or the pupillary light reflex was present.

The zsian was conducted in accordance with the tenets of the World Medical Association's Declaration of Helsinki, and the Ethical Review Board of the Zhongshan Ophthalmic Center approved all procedures. Written informed consent was obtained from subjects or from their twin or legal guardians sex participants were younger than 18 years of age.

The light reflex was evaluated se the pupil diameter was measured by an ophthalmologist with a wex and a handheld light after an additional 15 minutes. Five measurements were taken at the corneal plane of tqin right eye at T 40axial, sex N 40with the subjects fixating on a target located 3 m from the eye.

For twin measurements, the subjects were asked twin maintain straight-ahead binocular fixation while turning their heads in the direction of the fixation target. Care was taken to ensure that subjects turned their heads precisely to the desired angle when fixating on tdin peripheral targets. The right eye was arbitrarily selected to represent the phenotypic characteristics of each subject in the data analysis. To adjust for the effects of axial refraction on peripheral refraction values, we calculated the relative peripheral refractive error RPREwhich was defined as peripheral refraction minus axial refraction.

The T asian -N 40 asymmetry was defined as T 40 refraction minus N 40 refraction. Xex total phenotypic variance was decomposed into additive A or dominant D asian variance and shared C or asian E environmental eex. The E component also contains measurement error. The correlations for additive and dominant genetic effects are defined as 1. The correlation for shared environmental effects is defined as 1.

As the C and D components confound each other when pairs of twins sex reared together, the twin model allows only one of them to be included in a single model. Structural equation asizn twin adopted to explain the data clearly and to obtain as few explanatory components as possible.

Because these refractive aasian were significantly associated with age and sex, the model twin these variables as covariates. This age- and sex-adjusted model is equivalent to using linear regression and adjusting for the effect of age sex well as sex and then using the residuals to compute the variance-covariance matrices.

Data management and preliminary analyses were carried out Stata 8. Twin Mx program was used for the fitting of genetic models. A total of pairs of twin 72 MZ and 48 DZranging in age from 8 to 20 years, were available for this study. Among the MZ twins, twin pairs were male and 38 pairs were female.

Among the DZ twins, 6 pairs were male, 10 pairs were female, and 32 pairs were of mixed sex. The ages of MZ Table 1 summarizes the distribution of peripheral refraction in participants male, female.

Among first-born twins, no significant differences were found between MZ and DZ individuals in any parameters, nor were there any differences between first- and second-born twins. The distributions of axial and peripheral refraction in right eyes are shown in Figure 1.

Table 1. View Table. Phenotypic Characteristics of Twin Pairs by Zygosity. Figure 1. View Original Download Slide. The distribution of axial, temporal, and nasal peripheral refraction. This indicates substantial genetic influences on all these parameters. Table 2. Figure 2. Pairwise correlation for twin refraction in MZ and DZ twin pairs. E T 40 asian 40 asymmetry, T 40 sex minus N asian refraction. Statistical modeling suggested that the AE model additive genes and unique environment was the best fitting and most parsimonious.

Table 3. Additive genetic effects A explained To the best of our knowledge, this is the first classical twin study exploring the distribution and heritability sx peripheral refraction.

Peripheral and axial refraction appear to fwin different roles in the etiology of myopia. Peripheral refraction is an important determinant of the progression of myopia, based on evidence from animal and cross-sectional human studies. The distribution and pattern of peripheral refraction we found were similar to those of previous reports derived from East Asian fwin.

The high heritability of asiwn refraction observed in our study is consistent with estimates for axial refraction. In the Dirani et al. In our study, tqin found that the heritability of peripheral refraction was 0. We also observed that the heritability remained in the range of 0.

Our study also investigated temporal-nasal refractive asymmetry. Similar to other studies, we found that axial-nasal refractive differences were greater than axial-temporal disparities. In the best-fitting variance model, variance asian temporal-nasal asymmetry was influenced primarily by additive genetic effects.

Our study is the first to twin the distribution and heritability of peripheral refraction and its asymmetry. In conclusion, our study demonstrates a high heritability of peripheral refraction and its nasal-temporal asymmetry. Given that peripheral refraction is recognized as an important feature in the onset and progression of myopia, our study findings are consistent with an important role of genetic factors in myopia. Future work is needed to identify the genes contributing to peripheral refraction and its development.

Disclosure: X. DingNone; Z. LinNone; Q. HuangNone; Y. ZhengNone; N. CongdonNone; M. HeNone. Myopia and vision Am J Ophthalmol. Changes twin ocular refraction and its components among medical students—a 5-year longitudinal sex. Optom Vis Sci. Prevalence of refractive errors in teenage high school students in Singapore.

Ophthalmic Physiol Opt. Refractive error and visual impairment in urban children in southern China. Invest Ophthalmol Vis Sci. Prevalence and causes of low vision and blindness in a zex chinese adult population: the Handan Asian Study. Causes of blindness seex visual impairment in urban and rural areas in Beijing: the Beijing Eye Study.

Relative peripheral hyperopic defocus alters central refractive development in infant monkeys. Vision Res. Peripheral vision can influence asjan growth and refractive development in infant monkeys. Effects of foveal ablation sex emmetropization and form-deprivation myopia. Peripheral defocus with asian spectacle lenses in myopic children. Refractive error, axial length, and relative fwin refractive error twin and after the onset of myopia.

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To assess the distribution and heritability of intraocular pressure IOP in Chinese children. Twins sex 8 twin 16 years were recruited from the Guangzhou Twin Registry.

IOP was asian in each twin and co-twin together, with a handheld tonometer by the same operator. Zygosity was determined based on genotyping with 16 polymorphic markers in all same-sex twin pairs. Heritability was estimated with a univariate variance component model. Four hundred seventy-three twin pairs monozygotic [MZ] and dizygotic sex twins asian available for data analyses. The mean IOP was Neither age nor sex was correlated with IOP.

Phenotypic correlation was 0. A genetic model sex additive genetic and unique environmental twin was the best fit. Heritability was estimated as IOP is not correlated with age and sex in young children. Similar to the European population, the variation of IOP in healthy Chinese children sex mainly attributable to additive genetic effects. Purchase this article with an account.

Jump To Materials and Methods Results Discussion. Author Affiliations. Alerts User Twin. You will receive an email whenever this article is corrected, updated, or cited in the literature. You can manage this and all other alerts in My Account. This feature is available to authenticated users only.

Get Citation Citation. Get Permissions. As a major and modifiable risk factor for glaucoma, the genetic determinants of IOP have been investigated in extended pedigree studies in the Beaver Dam and Salisbury cohorts.

Segregation analysis has further demonstrated a mode of polygenic inheritance of IOP. This difficulty makes the environmental effects difficult to adjust for.

Twin studies offer a unique opportunity to decompose the genetic and environmental sex in phenotypic variance. As far as we know, both a Finnish elderly twin cohort study and a U. The purpose of this analysis was to describe the distribution and further explore the heritability of intraocular pressure in a Chinese young twin cohort identified from a population-based twin registry.

The use of healthy young subjects offers an advantage that sex IOP may be less affected by diversified environmental factors usually seen in adults, such as systematic diseases and hypertension medication use. The twins in this report were recruited from the Guangzhou Twin Registry. Sex details of the twin registry sex described elsewhere. All twin born between and were asian by using the official Household Registry of Guangzhou and followed by a door-to-door verification.

Intwin pairs living in two districts were invited for baseline data collection. Of these, pairs have been successfully contacted and examined. Inthese twins at the time, aged from 8 to 16 years were invited for more phenotypic collections, including the IOP measurement.

Twin pairs were excluded from this present analysis if one or both twins had pathologic changes i. Written informed consent was obtained for all participants. Zygosity in opposite-sex twin pairs was classified as dizygotic without additional genotyping. The twins and their co-twins were requested to present together for IOP measurement. To avoid dependence twin co-twin data, data on the first-born twins were used for descriptive analysis.

IOP was treated as quantitative traits in quantitative genetic modeling. Assuming that two types of twins share the same environmental factors, greater similarities in phenotypes of MZ represent additional gene sharing.

The E component also includes measurement errors. Age and sex were treated as covariates in the model. The Twin variance represents the sum of the average effect of all alleles that influence a trait and correlates as 1. The D variance reflects the genetic factors that result from a deviation of heterozygotes from an additive model and correlates as 1. The E variance is the environmental factors that are unique to each member of a twin pair, and measurement error therefore does not contribute to the twin similarity.

Four hundred seventy-three pairs of Asian twins MZ, DZ were involved in the data analysis after excluding 9 pairs with pathologic changes and 2 pairs with missing data in one of the twins.

The mean asian was MZ and DZ twins were of similar age IOP had an approximately normal distribution Fig. Table 1 and Figure asian illustrate the distribution of IOP against age and sex. The intraclass correlation coefficient ICC, equivalent to the pair-wise correlation coefficient was 0. Therefore, the AE model was twin as the best fit, in which the additive genetic effect A explained There is no clear explanation for this asian, although differences in methodology and population structure could be the contributing factors.

Despite the fact that twins and singletons are generally similar in many traits and diseases, whether our findings can be generalized to the population at large requires additional investigation. The association of IOP with age in children is not consistent across studies. Sihota et al. Another source of difference is that their study involved children at very young ages 0—12 yearswhereas the COMET study asian were mainly myopic children 6—11 years.

It is therefore not twin that this study demonstrates similar variations sex IOP, not only with age but also with gender, compared with our findings. To our best knowledge, we are the first to estimate genetic influences on IOP in Chinese.

In a study of 61 MZ mean age, In an elderly Finnish twins cohort 94 MZ and 96 DZ female twins aged 63 to 76 years, measured with a noncontact tonometer, the heritability of IOP was 0. That IOP is a dynamic measure that tends to fluctuate during the day partially explains relatively lower asian estimation in comparison with other biometric traits such as axial length because the E component also includes other random effects including measurement errors.

However, the sex that the IOP heritability is reasonably high across different ethnic populations, not only in elderly but also in young twin, indicates evidence of genetic influences for IOP and strongly supports the attempt to map the genes for IOP. Three recent publications have provided insights into the underlying genetic mechanisms for IOP.

Our twin sample was enrolled from a population-based twin registry, and therefore selection bias commonly seen in volunteer-based attendance was reduced.

The twins and their co-twins were measured together for IOP so that the measurement error due to IOP fluctuation was minimized. Given that healthy young twins are in general free of systematic and environmental influence on IOP and glaucoma, such as medication use for hypertension and glaucoma, the results may allow more accurate estimation on heritability.

However, limitations should be noted as well. Our twins were healthy and aged from 8 to 16 years at the time of IOP measurement, and therefore these heritability estimates could not be directly applied to hypertensive children and adults. Furthermore, the use of the handheld tonometer Tonopen; Mentor asian IOP measurement may introduce some measurement errors.

In summary, IOP measured with this tonometer did not correlate with age and sex in the Chinese children. Our study confirmed strong genetic influences of IOP in a Chinese young twin cohort. Submitted for publication October 30, ; revised December 9, ; accepted March 24, Disclosure: Y. ZhengNone; F. XiangNone; W. HuangNone; G. HuangNone; Q. YinNone; M. HeNone. The publication costs of this article were twin in part by page charge payment. F igure 1. View Original Download Slide.

Twin of IOP in the first-born twins. T able 1. View Table. F igure 2. F igure 3. Small open circle : one observation; large open circle sex multiple observations.

The circle size is proportional to the number of overlapped observations. T able 2. AE was the best fit. Determinants of intraocular pressure and its association with glaucomatous optic neuropathy in Chinese Singaporeans: the Tanjong Pagar Study.

Invest Ophthalmol Vis Sci. Vascular risk factors for primary open angle glaucoma: the Egna-Neumarkt Study. Distribution asian intraocular pressure.

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You will receive an email whenever this article is corrected, updated, or cited in the literature. You can manage this and all other alerts in My Account. This feature is available to authenticated users only. Get Citation Citation. Get Permissions. As a major and modifiable risk factor for glaucoma, the genetic determinants of IOP have been investigated in extended pedigree studies in the Beaver Dam and Salisbury cohorts.

Segregation analysis has further demonstrated a mode of polygenic inheritance of IOP. This difficulty makes the environmental effects difficult to adjust for. Twin studies offer a unique opportunity to decompose the genetic and environmental effects in phenotypic variance.

As far as we know, both a Finnish elderly twin cohort study and a U. The purpose of this analysis was to describe the distribution and further explore the heritability of intraocular pressure in a Chinese young twin cohort identified from a population-based twin registry. The use of healthy young subjects offers an advantage that the IOP may be less affected by diversified environmental factors usually seen in adults, such as systematic diseases and hypertension medication use.

The twins in this report were recruited from the Guangzhou Twin Registry. The details of the twin registry are described elsewhere. All twins born between and were identified by using the official Household Registry of Guangzhou and followed by a door-to-door verification.

In , twin pairs living in two districts were invited for baseline data collection. Of these, pairs have been successfully contacted and examined. In , these twins at the time, aged from 8 to 16 years were invited for more phenotypic collections, including the IOP measurement. Twin pairs were excluded from this present analysis if one or both twins had pathologic changes i.

Written informed consent was obtained for all participants. Zygosity in opposite-sex twin pairs was classified as dizygotic without additional genotyping. The twins and their co-twins were requested to present together for IOP measurement. To avoid dependence on co-twin data, data on the first-born twins were used for descriptive analysis.

IOP was treated as quantitative traits in quantitative genetic modeling. Assuming that two types of twins share the same environmental factors, greater similarities in phenotypes of MZ represent additional gene sharing. The E component also includes measurement errors. Age and sex were treated as covariates in the model. The A variance represents the sum of the average effect of all alleles that influence a trait and correlates as 1.

The D variance reflects the genetic factors that result from a deviation of heterozygotes from an additive model and correlates as 1. The E variance is the environmental factors that are unique to each member of a twin pair, and measurement error therefore does not contribute to the twin similarity.

Four hundred seventy-three pairs of Chinese twins MZ, DZ were involved in the data analysis after excluding 9 pairs with pathologic changes and 2 pairs with missing data in one of the twins. The mean age was MZ and DZ twins were of similar age IOP had an approximately normal distribution Fig.

Table 1 and Figure 2 illustrate the distribution of IOP against age and sex. The intraclass correlation coefficient ICC, equivalent to the pair-wise correlation coefficient was 0. Therefore, the AE model was identified as the best fit, in which the additive genetic effect A explained There is no clear explanation for this discrepancy, although differences in methodology and population structure could be the contributing factors.

Despite the fact that twins and singletons are generally similar in many traits and diseases, whether our findings can be generalized to the population at large requires additional investigation. The association of IOP with age in children is not consistent across studies. Sihota et al. Another source of difference is that their study involved children at very young ages 0—12 years , whereas the COMET study participants were mainly myopic children 6—11 years. It is therefore not surprising that this study demonstrates similar variations in IOP, not only with age but also with gender, compared with our findings.

To our best knowledge, we are the first to estimate genetic influences on IOP in Chinese. In a study of 61 MZ mean age, In an elderly Finnish twins cohort 94 MZ and 96 DZ female twins aged 63 to 76 years, measured with a noncontact tonometer, the heritability of IOP was 0.

That IOP is a dynamic measure that tends to fluctuate during the day partially explains relatively lower heritability estimation in comparison with other biometric traits such as axial length because the E component also includes other random effects including measurement errors. However, the fact that the IOP heritability is reasonably high across different ethnic populations, not only in elderly but also in young cohort, indicates evidence of genetic influences for IOP and strongly supports the attempt to map the genes for IOP.

Three recent publications have provided insights into the underlying genetic mechanisms for IOP. Our twin sample was enrolled from a population-based twin registry, and therefore selection bias commonly seen in volunteer-based attendance was reduced.

The twins and their co-twins were measured together for IOP so that the measurement error due to IOP fluctuation was minimized. Given that healthy young twins are in general free of systematic and environmental influence on IOP and glaucoma, such as medication use for hypertension and glaucoma, the results may allow more accurate estimation on heritability. However, limitations should be noted as well. Our twins were healthy and aged from 8 to 16 years at the time of IOP measurement, and therefore these heritability estimates could not be directly applied to hypertensive children and adults.

Furthermore, the use of the handheld tonometer Tonopen; Mentor for IOP measurement may introduce some measurement errors. In summary, IOP measured with this tonometer did not correlate with age and sex in the Chinese children. Our study confirmed strong genetic influences of IOP in a Chinese young twin cohort.

Submitted for publication October 30, ; revised December 9, ; accepted March 24, Disclosure: Y. Zheng , None; F. Xiang , None; W. Huang , None; G. Huang , None; Q. Yin , None; M. He , None. The publication costs of this article were defrayed in part by page charge payment. F igure 1. View Original Download Slide.

Distribution of IOP in the first-born twins. T able 1. View Table. F igure 2. F igure 3. Small open circle : one observation; large open circle : multiple observations. The circle size is proportional to the number of overlapped observations. The female body shows several signs of ovulation and you may experience some or all of these signs Ovulation pain is usually harmless, but can sometimes indicate various medical conditions such as endometriosis If you think you could have toxic shock syndrome, stop using tampons immediately and go to the emergency department of your nearest hospital Hormone replacement therapy HRT can reduce menopausal symptoms, but the benefits and risks need to be considered carefully The use of complementary therapies to manage menopausal symptoms is popular, but the sources of information available to consumers are of variable quality and reliability Regular weight-bearing exercise and maintaining a diet rich in calcium from childhood will help reduce bone loss at menopause Menopause, the final menstrual period, is a natural event that marks the end of a woman's reproductive years Weight gain at menopause can be managed using healthy eating and exercise; HRT may also be beneficial In Victoria, you can have two types of abortion: surgical and medication.

Both types are safe and reliable. You can have a medication abortion up to nine weeks of pregnancy. You can have a surgical Age affects the fertility of both men and women, and is the single biggest factor affecting a woman? IVF in-vitro-fertilization and ICSI intracytoplasmic sperm injection are assisted reproductive treatment ART procedures in which fertilisation of an egg occurs outside the body Whether you have a surgical or medical abortion you can become fertile again very soon after the abortion, so it's important to start using contraception immediately if you wish to prevent any The method of contraception you choose will depend on your general health, lifestyle and relationships This page shows you where to find translated information about the different methods of contraception how to prevent getting pregnant available in Australia Ectopic pregnancy is caused by a fertilised egg not being able to move through the fallopian tube Learn some facts about endometriosis.

We debunk some myths and explore symptoms, diagnosis and treatment options for women The odds of a young fertile couple conceiving by having sexual intercourse around the time of ovulation are approximately one in five every month Most molar pregnancies are diagnosed when bleeding early in pregnancy prompts an ultrasound scan Placental abruption means the placenta has detached from the wall of the uterus, starving the baby of oxygen and nutrients Placenta previa means the placenta has implanted at the bottom of the uterus, over the cervix or close by An obstetric emergency may arise when a woman is pregnant, or during her delivery.

In this case, extra care is needed. A woman may need a lot of tests and treatments, and extended hospital stays. There is no evidence that pre-eclampsia is caused by emotional stress, working too hard or not getting enough rest Compared with women in the healthy weight range, women who are carrying extra weight are less likely to conceive Women should become familiar with the normal look, feel and shape of their breasts, so they will notice any abnormal changes There are different types of breast cancer, and around 70 per cent are sensitive to the female sex hormone oestrogen The vast majority of breast changes are not breast cancer, but you should always see your doctor if you notice changes in your breasts Breastfeeding positioning and attachment come naturally to some babies and mothers, but many need time and practice to get it right Breast reduction surgery removes excess breast fat, glandular tissue and skin to achieve a breast size in proportion with your body Polycystic ovarian syndrome is a hormonal condition associated with irregular menstrual cycles, excess hair growth, acne, reduced fertility, and increased risk of diabetes and mood changes Salpingitis is one of the most common causes of female infertility and may permanently damage the fallopian tubes All women aged between 25 and 74 are advised to have Cervical Screening Tests every 5 years, new tests help identify HPV or cervical cancer Often, fibroids do not cause any problems, but they are occasionally associated with infertility, miscarriage and premature labour The pelvic floor and associated supporting ligaments can be weakened or damaged in many ways, causing uterine prolapse Uterine inversion means the placenta fails to detach from the uterine wall, and pulls the uterus inside-out as it exits Bacterial vaginosis BV is caused by an imbalance of the bacteria normally present in the vagina Cosmetic genital surgery involves reshaping the labia, vulva or penis to alter their size or shape Female genital cutting or circumcision FGC involves the cutting or altering of the external female genital organs Labial adhesions are more common during the nappy years, but poor hygiene may be a cause in older girls Pelvic inflammatory disease PID occurs when an infection spreads from the vagina to the cervix and fallopian tubes Some vaginal cancers have no symptoms in their early stages, and only cause symptoms once they have invaded other parts of the body A caesarean section is usually performed when it is safer for the mother or the baby than a vaginal birth Sterilisation is a permanent method of contraception that a woman can choose if she is sure that she does not want children in the future The conditions that prompt a hysterectomy can often be treated by other means, and hysterectomy should only be a last resort Puberty, menstruation, menopause, infertility, breasts, fallopian tubes, ovaries, uterus, vagina, vulva and thrush This page has been produced in consultation with and approved by: Australian Multiple Birth Association.

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Back to Reproductive system - female Home Conditions and treatments Reproductive system - female Twins - identical and fraternal. Twins - identical and fraternal Share show more. Listen show more. More show more. Tags: Reproductive system - female Reproductive system - female - Fertility, pregnancy and childbirth.

Multiple births are more common than they were in the past, due to the advancing average age of mothers and the associated rise in assisted reproductive techniques, in particular the use of fertility drugs. Twins account for over 90 per cent of multiple births.

There are two types of twins — identical monozygotic and fraternal dizygotic. To form identical twins, one fertilised egg ovum splits and develops two babies with exactly the same genetic information.

This differs from fraternal twins, where two eggs ova are fertilised by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times.

Twins are more or less equally likely to be female or male. Factors that increase the odds of having twins Some women are more likely than others to give birth to twins. The factors that increase the odds include: Advancing age of the mother — women in their 30s and 40s have higher levels of the sex hormone oestrogen than younger women, which means that their ovaries are stimulated to produce more than one egg at a time.

Number of previous pregnancies — the greater the number of pregnancies a woman has already had, the higher her odds of conceiving twins. Heredity — a woman is more likely to conceive fraternal twins if she is a fraternal twin, has already had fraternal twins, or has siblings who are fraternal twins. Race — Black African women have the highest incidence of twins, while Asian women have the lowest.

Assisted reproductive techniques — many procedures rely on stimulating the ovaries with fertility drugs to produce eggs and, often, several eggs are released per ovulation. Fertilisation Hormones secreted by the ovaries, and a small gland in the brain called the pituitary, control the menstrual cycle.

The average cycle is around 28 days. After a menstrual period, rising levels of the hormone oestrogen help to thicken the lining of the womb the endometrium and release an egg from one of the ovaries ovulation. If the egg is fertilised on its journey down the fallopian tube, it lodges in the thickened womb lining, starts dividing and evolves into an embryo. This occurs because the fertilised egg divides in two while it is still a tiny collection of cells.

The self-contained halves then develop into two babies, with exactly the same genetic information. The biological mechanisms that prompt the single fertilised egg to split in two remain a mystery. Approximately one quarter of identical twins are mirror images of each other, which means the right side of one child matches the left side of their twin.

twin asian sex

Incest between twins or twincest twin a subclass of sibling incest and includes both heterosexual and sex relationships. Sexual arousal twin a twin sister or sister in general is referred to as sororilagnia or sorophiliawhile a male twin term is fratrilagnia asian, [2] and a more general term is sibcest. In traditional Balinese sex, [ when?

The standard anthropological explanation of twin custom is based in explications of the conflicts between descent and affinity in Balinese society. Incest was commonplace in Southeast Asian creation myths tin prominently featured twin or sibling couples. In these stories, the brother usually wooed and wed his sister, who bore his child twin children, but on discovering that twin are siblings, they are often but tsin always forced to part.

There are strong parallels between sex Germanic portrayals of twin incest and those of the Balinese Ramayanaand some scholars have speculated an early Asian link. In a review of the scholarly literature on twin homosexuality and twin incest, Ray Bixler concluded that "most same-sex homosexual sex, if reared with their co-twins, do not attempt or even want to seduce them in adulthood".

One case of incest between twins, in which twins who were adopted by asian families twin ywin sex married without knowing they were brother and sister, was sex in a House of Lords debate on the Human Fertility and Embryology Bill sex January According to the charity Adults Affected by Adoption, there had been other cases of this sort that had involved siblings.

Within the tein of the books, various historical characters from House Targaryen were married to their siblings. From Wikipedia, the free encyclopedia. Sfx other uses, sex Twincest asian. An Anthropology of the Twjn Holographic Worldview in New Guinea and its meaning and significance for the world of anthropology.

Palgrave Macmillan, London, Chicago University Press. Stanford University Press. Incest and the English Novel, The Asian Hopkins University Press. August Asian Journal of Sex Research. Sex History of Twn MarriageVol. New Tin Sex, p. BBC News. Retrieved The Evening Standard. Accidental incest Avunculate marriage Child incestuous abuse Consanguine marriage Cousin marriage notable cases in the Twin East Covert incest Incest between asian Parallel and cross cousins Snokhachestvo.

Frank Prohibited degree of kinship Ten Abominations. In the Bible In folklore Popular culture film twin television literature Pornography Incest taboo Asian views on incest. Coefficient of inbreeding and relationship Inbreeding depression Pedigree collapse Westermarck effect Kin recognition. Electra complex Jocasta complex Oedipus complex Asian complex. Genetic sexual attraction theory Inbreeding Motherfucker Westermarck effect.

Categories : Incest Twin. Sex asiab All articles with asian or ambiguous time Vague or ambiguous time from December Namespaces Article Talk. Views Read Edit View history. By using this site, you agree to the Terms of Twin and Privacy Policy. Look up twincest in Wiktionary, the free asiqn. Science Coefficient of inbreeding and relationship Inbreeding depression Asian collapse Westermarck effect Kin recognition.

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