Is It Possible For A Boy Girl Pair Of Twins To Be Genetically Identical?
Is It Possible For A Boy Girl Pair Of Twins To Be Genetically Identical? In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair. … An