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  2. Fraternal birth order and male sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Fraternal_birth_order_and...

    The fraternal birth order effect has been described by one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men". [5] In 1958, it was reported that homosexual men tend to have a greater number of older siblings (i.e., a 'later/higher birth order') than comparable heterosexual men and in 1962, these findings were published in detail. [6]

  3. Multiple birth - Wikipedia

    en.wikipedia.org/wiki/Multiple_birth

    Dizygotic (fraternal) twins can be caused by a hyperovulation gene in the mother. [8] Although the father's genes do not influence the woman's chances of having twins, he could influence his children's chances of having twins by passing on a copy of the hyperovulation gene to them. Monozygotic (identical) twins do not run in families.

  4. Concordance (genetics) - Wikipedia

    en.wikipedia.org/wiki/Concordance_(genetics)

    A twin study compares the concordance rate of identical twins to that of fraternal twins. This can help suggest whether a disease or a certain trait has a genetic cause. [3] Controversial uses of twin data have looked at concordance rates for homosexuality and intelligence. Other studies have involved looking at the genetic and environmental ...

  5. Twin - Wikipedia

    en.wikipedia.org/wiki/Twin

    The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...

  6. Birth order - Wikipedia

    en.wikipedia.org/wiki/Birth_order

    The fraternal birth order effect is the name given to the theory that the more older brothers a man has, the greater the probability is that he will have a homosexual orientation. The fraternal birth order effect is said to be the strongest known predictor of sexual orientation, with each older brother increasing a man's odds of being gay by ...

  7. George Clooney and Amal Clooney reveal the gender of their twins

    www.aol.com/article/entertainment/2017/02/16/the...

    After George and Amal Clooney broke the internet last week by announcing they're expecting twins, their genders have finally been revealed. ...

  8. What are the odds? Fort Pierce couple welcomes twin ... - AOL

    www.aol.com/odds-fort-pierce-couple-welcomes...

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  9. Biology and sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Biology_and_sexual_orientation

    Identical twin studies are a useful mechanism for assessing the role of genes and environment. Twin studies have also found that among twins with differing sexual orientations, homosexual twins were significantly more gender nonconforming than their heterosexual co-twin, and that this was noticeable from a young age. [29] Bailey states: