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I thought this was the coolest thing I have read about twins and thought I would share it with you.
The rarest type of twins were discovered by accident in the second trimester. When in her first trimester they noticed she was having twins and the twins were going to be identical. The second trimester came and even though they still agreed the twins were going to be identical they were stunned to find out she was having a girl and a boy. With identical twins they are either both boys or girls, but not in this case.
A pair of Australian siblings are some of the rarest humans ever documented, according to their doctors. They say the brother and sister are semi-identical twins, sharing the exact same DNA from their mother’s side, but only a portion of their father’s genetic makeup. The children are thought to be only the second case of semi-identical twins discovered, and the first to be identified during pregnancy.
the authors theorize, two sperm cells simultaneously fertilized the
same egg. Ordinarily, that sort of mistake quickly results in a
miscarriage, since humans usually can’t develop with three different
sets of chromosomes. Somehow, though, the resulting zygote incorporated
an equal split of DNA from all three sets, with three groups of cells
forming afterward: Cells containing the mother’s DNA and DNA from sperm
1; cells with the mother’s DNA and DNA from sperm 2; and cells
containing DNA from only sperm 1 and 2. Over time, the third group of
sperm-only cells was effectively crowded out by the cells containing DNA
from both parents. Then, even more unexpectedly, the bundle of cells
divided into two embryos, creating the twins.“They are 100
percent identical on the mother’s side and 78 percent identical the
father’s side, so this averages out to being 89 percent identical,” lead
author Michael Gabbett, a geneticist at Queensland University of
Technology, told Gizmodo.
The U.S. doctors reported that the splitting of paternal chromosomes
resulted in one twin being intersex, meaning they had ambiguous
genitalia; the other was anatomically male. The Y chromosome is usually
what determines a person’s sex, with biological males predominantly
having XY chromosomes in their cells. Both twins, as it turned out, had a
mix of XY and XX sex chromosomes, but the intersex twin only had a 5
percent split of XY compared to XX, while the anatomically male twin had
a 50-50 split. The anatomically male twin’s share of XX genes simply
wasn’t enough to stop them from developing male sex organs.
So word was in the early stages the one twin was female and flipped in the womb to intersex but the article calls her female but she has issues too.
So reading the past about intersex children and adults I wonder if some of them had a twin in the womb? It's common knowledge for one to disolve soo. /shrugs. What do you think?
Australian Siblings Are Semi-Identical Twins, Some of the Rarest Humans Ever
A pair of Australian siblings are some of the rarest humans ever documented, according to their doctors. They say the brother and sister are semi-identical twins, sharing the exact same DNA from their mother’s side, but only a portion of their father’s genetic makeup. The children are thought to be ....×