Identical twins same sex
Identical (monozygotic) twins are always of the same sex because they form from a single zygote (fertilized egg) that contains either male (XY).
Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic . Monozygotic twins are genetically nearly identical and they are always the same sex unless there has been a mutation during development.
Twin - Wikipedia
Twins With Different Sexual Orientations: How Could it Happen?
Types of Twins : Identical, Fraternal & Unusual Twinning
Description:This condition means that blood from one twin is being diverted into the other twin. One study estimates that the frequency of heteropaternal superfecundation among dizygotic twins whose parents were involved in paternity suits was approximately 2. Twin Studies Twin studies are studies that assess identical monozygotic twins for medical. A study of 80 pairs of twins ranging in age from 3 to 74 showed that the youngest twins have relatively few epigenetic differences. This does not mean that the twins will be identical in every way. This case is much more rare, and is different from both identical and fraternal twins.
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