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Fact of the Day More Information Sometimes when human embryos are forming they can split into twins. Now we know that twin embryos are also able to fuse together. The embryos do not even have to be identical to do so nor do they have to be of the same sex. The person who results from such a fusing has two sets of DNA, two sets of genes. It is possible for two female embryos to produce a normally functioning girl (as well as two males a boy). This boy and this girl will each have two sets of DNA. For instance, a woman chimera who has given birth may show different DNA than the child via a blood test. Her blood is one type but some of her organs (ovaries, bladder, etc.) are another; technically her would-be twin "sister's". When a male and female embryo fuse together the resulting human may have some problems. As rare as this is, the common result is a hermaphrodite with an unworking testicle and ovaries on that side of the body. The sexuality is cut vertically down the middle.
Since twinning is the breeding ground for Chimerism to form, in vitro fertilization may cause a larger population of chimeras to develop. Many of the new cases of Chimerism come from in vitro babies.
The somewhat crazy scientists studying this in animals have created mixed species via forcibly fusing embryos. The geep is just one unnatural concoction; a combination goat and sheep. View All Facts View Images View Maps Blog
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