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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?


      https://gizmodo.com/australian-siblings-are-semi-i...

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          Ghostolini
          2 months ago

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          Fascinating, and hoping for all the best for the twins.


          I worry about "ambiguous" genitalia kids. But it seems with the genetic testing we have now they can be more definitive in giving that twin female genitalia. My understanding of the past approach was to guess or do what was easiest, or go by parental whim.

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              Ghostolini
              2 months ago

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              This is completely new to me. Interesting. Now you have me thinking. Can a decision be made by someone other than the intersex child as to surgery or some form of hormonal treatment be given that child without their consent? Also, should a child have some form of surgery or hormonal treatment, how will that affect them in other ways, such as psychologically or socially? I have to look up and see if there are any follow up studies that have been done with intersex children.

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                  Richard Caslon
                  2 months ago

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                  They have been doing just that. For decades before the 90's the parents or the doctor chose the sex of theses children. But quite a few of the children grew up thinking they were the opposite sex chosen for them. Many of these same children the parents were not allowed to choose. A few doctors even took offense at parents that wanted to wait until they saw if their child was leaning toward male or female. The doctors claimed it was better for the child if the surgery was done early. So many actually forced parents to get the surgery and hormone treatments. Some did testing before hand which helped but some children even the testing was no help. The lucky ones had ovaries, or testicles. The unlucky ones had neither, or had something but testing didn't even help and these were the ones that had the most issues. In the late 90's I believe a few doctors decided to wait until the children were old enough to throw off hints or signs of which gender they wanted to be. It was just recently that parents united and decided they would play no major roll in deciding the gender of their child they left it entirely up to the child when they got older. Recently we have had a State to add the no gender option on birth certs. Youtube has a few videos on this topic but it's been a few years since I watched them. I don't even remember the titles. Plus because it has been years, the videos may not be there anymore. Angela BridgmanopieRichard Caslon The only reason why I knew anything about it is because back when I was young 20-21 years old Fair Grounds treated these children like freaks, and they actually had shows that showed films of them. I only saw it because my date was hell bent on seeing them. I had no clue at the time at what I was fixing to see. So the film showed adults with both between the legs and some in different what looked like stages of deformed, to not even recognizing what it was.

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                          Ghostolini
                          2 months ago

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                          I happen to know a chymera. This is one who had a vanishing twin.because the one twin literally absorbed the other twin in utero. This is also known as a chymera.

                          Normally this only happens with twins of the same gender, but my friend had a vanishing female twin and is intersex.

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