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Erika Patten, who has boy-girl twins and a singleton son, had extreme nausea that made her lose 15 pounds in nine weeks during her twin pregnancy. She. Because the twins come from one egg and one sperm, they have exactly the same DNA and are, therefore, identical twins. Fraternal twins, on the other hand, develop when there are two different eggs in the mother's womb that are fertilized by two different sperm. Fraternal. The twins can be two girls, two boys, or a boy and a girl. Identical twins occur when a single fertilized egg splits and develops into two fetuses. Identical twins might share a placenta and an amniotic sac or the twins might share a placenta and each have separate amniotic sacs. Genetically, the two babies are identical.