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Identical (monozygotic) twins are always of the same sex because they form from a single zygote (fertilized egg) that contains either male (XY) or female (XX) sex chromosomes. Fraternal twins can be either two girls, two boys, or one of each.

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Most of the time, monozygotic twins have separate amniotic sacs but share one placenta. The technical term for this is monochorionic-diamniotic (or Mo-Di), and it occurs between 60 and 70 percent of the time with monozygotic twins.

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A pair of monozygotic, adolescent twins is discordant for sex. The phenotypic female twin has chromosome constitution of 46, XY/45, X. She displays many signs of Turner's syndrome, including typical facies, webbed neck, malformed left kidney, high plasma gonadotropins, and streak ovaries.


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The term “identical twins” is generally used as a synonym for “monozygotic (MZ) twins.” Both terms assume that that the twins developed from the same fertilized egg (zygote), have identical DNA, and therefore look identical. But, as explained here, identical twins do not always look exactly the same.

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Watch Real Twins Fuck Each other video on xHamster, the greatest sex tube site with tons of free New Twins & Free Xxx Fuck Tube porn movies! Watch Real Twins Fuck Each other video on xHamster, the greatest sex tube site with tons of free New Twins & Free Xxx Fuck Tube porn movies!/5(K). The difference between monozygotic and dizygotic twins is that in the former the twins develop from the same fertilized egg while in the latter the twins develop from two different fertilized eggs. Monozygotic twins have exactly the same genetic or hereditary material. Hence, they are called identical twins.

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