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The second case of the same semi-identical twins


(Newser)

There are the same twins, there aren't the same twins – and there are incredibly rare twins that fall somewhere between them. The second case, which was recorded in semi-identical or sesquizygotic twins, was described in a recent study. New England Journal of Medicine. The twins born in 2014 in Brisbane, Australia, were the first to be identified during pregnancy. Professor Nicholas Fisk, who is responsible for caring for the mother and the twins, explains that this is the case with the BBC reports. "The mother's ultrasound showed a single placenta for six weeks and indicated the placement of amniotic bags waiting for the same twins.

In the same twins, the fertilized egg decomposes into two; the twin twins are the result of the fertilization of the two eggs of the two eggs. Sesquizygotic twins occur when the eggs are fertilized by two sperm before cleavage. This means that there are three sets of chromosomes, two from the father and the mother, and the experts say it is very unusual for such embryos to survive, the Science Daily reports. The twins are more genetically similar than the twin twins, but less than the same twins: "The genotype of the amniotic fluid in each bag showed that the twins were the same, but 78% of the parental genome were shared," the study said. . Another known case in the United States was identified in 2007.

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