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  2. Causes of gender incongruence - Wikipedia

    en.wikipedia.org/wiki/Causes_of_gender_incongruence

    Among dizygotic or genetically non-identical twin pairs, there was only 1 of 38 (2.6%) pairs where both twins were trans. [9] The significant percentage of identical twin pairs in which both twins are trans and the virtual absence of dizygotic twins (raised in the same family at the same time) in which both were trans would provide evidence ...

  3. Conjoined twins - Wikipedia

    en.wikipedia.org/wiki/Conjoined_twins

    Conjoined twins, popularly referred to as Siamese twins, [1] [2] are twins joined in utero. [ a ] It is a very rare phenomenon, estimated to occur in anywhere between one in 50,000 births to one in 200,000 births, with a somewhat higher incidence in southwest Asia and Africa. [ 5 ]

  4. Lori and George Schappell - Wikipedia

    en.wikipedia.org/wiki/Lori_and_George_Schappell

    Guinness World Records declared Lori and George to be the first set of conjoined twins to have different gender identities. [14] Their family did not accept George's identity, as evidenced by his obituary and his mother's obituary; he was deadnamed and referred to as a daughter in both. [15] [16]

  5. World's oldest conjoined twins, Lori and George Schappell ...

    www.aol.com/news/worlds-oldest-conjoined-twins...

    After George Schappell came out, they became the first set of same-sex conjoined twins to identify as different genders, the site explained. The Schappell twins were craniopagus twins, meaning ...

  6. Parents surprised to learn twin toddlers have different fathers

    www.aol.com/news/2016-03-09-parents-surprised-to...

    A Viet Nam News article noted that although the toddlers are the same gender, ... Twins born with different skin tone. The parents, from Vietnam's northern Hoa Binh province, initially believed that.

  7. 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 ...

  8. My twins are both in college, and their dorm rooms show just ...

    www.aol.com/news/twins-both-college-dorm-rooms...

    My twins attend Fordham, but they have little in common. My daughter filled her dorm with her favorite things, and my son took a minimalist approach. ... Despite their different personalities and ...

  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: