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  2. Biracial twins look wildly different - AOL

    www.aol.com/news/2015-03-03-biracial-twins-look...

    Fraternal twins develop from two different eggs by two different sperm -- so they can often look slightly different. Although some, like Mary Kate and Ashley Olsen, end up looking so much alike ...

  3. Genotype–phenotype distinction - Wikipedia

    en.wikipedia.org/wiki/Genotype–phenotype...

    Identical twins share the same genotype, since their genomes are identical; but they never have the same phenotype, although their phenotypes may be very similar. This is apparent in the fact that close relations can always tell them apart, even though others might not be able to see the subtle differences.

  4. Twins and handedness - Wikipedia

    en.wikipedia.org/wiki/Twins_and_handedness

    Monozygotic twins result from the fertilization of one egg and the division of that single embryo forming two embryos. [4] However, just because a set of twins share the same genetic information, it does not mean they will exhibit the same traits and behaviors. There are different versions of a gene, which are called alleles. How a gene is ...

  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. Image credits: MontEcola #5. My wife is an identical twin. When we first started dating I could tell them apart from their voices, smell, makeup, and eyes.

  7. Desperate mom of twins calls police when she can't tell them ...

    www.aol.com/lifestyle/desperate-mom-twins-calls...

    The mother tweeted photos of her 2-month-old twins, Valentin and Lorenzo, explaining that the boys look slightly different in photos, however, "in person, they are the same." ... "Identical twins ...

  8. Superfecundation - Wikipedia

    en.wikipedia.org/wiki/Superfecundation

    In 1982, twins who were born with two different skin colors were discovered to be conceived as a result of heteropaternal superfecundation. [7] [5] In 1995, a young woman gave birth to diamniotic monochorionic twins, who were originally assumed to be monozygotic twins until a paternity suit led to a DNA test. This led to the discovery that the ...

  9. Biology and sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Biology_and_sexual_orientation

    Identical or monozygotic twins share their genes, while fraternal or dizygotic twins are only as genetically similar as any other sibling pair. When twins both share a trait, they are concordant for this trait; and when they differ they are discordant. If identical twins have a higher rate of concordance for a trait than fraternal twins, it ...