Monochorionic, diamniotic (MCDA) twins are the product of a single fertilized ovum (egg), resulting in genetically identical offspring Twins of different genders are universally accepted as a sound basis for a clinical determination that boy and girl twins are not identical However, in extremely rare cases, boy and girl twins can stem from the same fertilized egg Twins, who stem from the same fertilized egg, are called monozygotic twins The Twins That Are Neither Identical nor Fraternal They shared a placenta, but on the ultrasound, one looked like a boy, and the other a girl
Twin Transgender Story Jonas And Nicole Maines Told In Book Becoming Nicole People Com