Difference in twins of opposite sex
Can boy/girl twins be identical? Learn the difference between fraternal and identical twins and how it determines whether they can be different.
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Washington State Twin Registry
The majority of twins are fraternal twins (twins that look different from one another ). Chromosomes from the father's sperm determine gender: XX for a girl and.
Description:What are fraternal twins? A chimera may arise either from monozygotic twin fetuses where it would be impossible to detect , or from dizygotic fetuses, which can be identified by chromosomal comparisons from various parts of the body. This condition means that blood from one twin is being diverted into the other twin. The other embryo would still develop into a male XY. Early in this process, inaccurate copying of the sex chromosomes could result in the loss of the Y chromosome in some cells. One fetus acts as a parasite towards the other.
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