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Prenatal hormone exposure and risk for eating disorders: a comparison of opposite-sex and same-sex Sex from female twins.

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Every parent of twins faces the question "Are your twins identical or fraternal?" When your twins are a boy and girl pair, the answer is easy, but. Although psychosocial explanations of the increased sensation seeking in opposite-sex female twins cannot be excluded, these findings are consistent with . A pair of twins born in January in Australia share all of their mother's genes In addition, the girl and boy each have male and female sex.

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Male twins reduce fitness of female co-twins in humans. Association between co-twin sex and eating disorders in opposite sex twin pairs: evaluations in North American, Norwegian, and Swedish samples.

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J Psychosom Res. Achievement test performance in children conceived by IVF. Hum Reprod. Paternal age and intelligence: implications for age-related genomic changes in male germ cells. Psychiatr Genet. Influence of variation in birth weight within normalrange and within sibships on IQ at age 7 years: cohort study. A masculinizing form on the auditory systems of human females having male co-twins.

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Arch Sex Behav. Anorexia and bulimia nervosa in same-sex and opposite-sex twins: lack of association with twin type in a nationwide study of Finnish twins.

Am J Psychiatry. Gender, culture, and sex-typed cognitive abilities. Sensation seeking in opposite-sex twins: an effect of prenatal hormones? Behav Genet. Intrauterine hormone effects on tooth dimensions. J Dent Res. Birth weight and cognitive function in the British birth cohort: longitudinal population based study.

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Sex differences in mathematics and reading achievement are inversely related: within- and across-nation assessment of 10 years of PISA data. Sex differences in cognitive abilities test scores: a UK national picture.

Br J Educ Psychol. Evaluating the twin testosterone transfer hypothesis: a review of the empirical evidence. J Perinat Med. Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins.

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Twin-singleton differences in intelligence: Sex from female twins meta-analysis. Having a male co-twin masculinizes mental rotation performance in females. Psychol Sci. School functioning in 8- to year-old children born after in vitro fertilization.

Eur J Pediatr. Support Center Support Center. External link. Please review our privacy policy. Mathematics — oral and written average de. But, for a woman in New Jersey suing for child support, things are a little more complicated. It turns out the man she thought Sex from female twins the father of her twins was only the father of one of the pair. Here are the different types of multiple births:.

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Supplementary data. Conflict of. Why are there more same-sex than opposite-sex dizygotic twins? Satoshi Kanazawa. Correspondence address. E-mail: S. Kanazawa lse. Oxford Academic. Google Scholar. Nancy L Segal.

'Extraordinarily Rare' Semi-Identical Twins Were Born in Australia | Live Science

David de Meza. Cite Citation. Permissions Icon Permissions. Frok ADS. Studies on Sex from female twins diagnosis in twins with the aid of mailed questionnaires. Great expectations: maternal dominance, sex ratios and offspring reproductive success in red deer.

A twin study of heritable and shared environmental contributions to autism. Richer milk for sons but more milk for daughters: sex-biased investment during lactation varies with maternal life history in rhesus macaques. Holsteins favor heifers, not bulls: biased milk Se programmed during pregnancy as a function of fetal sex.

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Genetic and environmental factors in health-related behaviors: studies on Finnish twins and twin families. Maternal investment in relation to sex ratio and offspring number in a small mammal—a case for Trivers and Willard theory? Maternal quality and differences in milk production and composition for male and female Iberian red deer calves Cervus elaphus hispanicus. No evidence for sex biases in milk macronutrients, energy, or breastfeeding frequency grom a sample of Filipino mothers.

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Google Preview. Sex ratio and maternal rank in wild spider monkeys: when daughters disperse. Dynamics of human milk nutrient composition of women from Singapore with a special focus on lipids. All rights reserved. For Permissions, please e-mail: journals. Issue Section:. Download Sex from female twins figures. Supplementary Data.

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