Search from Boy Girl Identical Twins stock photos, pictures and royaltyfree images from iStock Find highquality stock photos that you won't find anywhere elseIn 999% of cases boy/girl twins are nonidentical 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 This happens when the fertilised egg 'loses' one of the copies of the Y chromosome when it is dividing into two embryos in very early development The resulting babies are then male (XY) and female (XO) The normal genetic makeup of a girlCheck out our boy girl twins adult selection for the very best in unique or custom, handmade pieces from our shops
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