Question: Identical twins differ from fraternal twins in their origin. Which statement explains why? Question options: Identical twins come from two secondary oocytes that are each fertilized in different uterine cycles. Identical twins come from one secondary oocyte that, after fertilization, divides and separates into two separate embryos usually before or during the blastocyst stage. Identical twins come from one secondary oocyte that, after fertilization, divides and separates into two separate embryos after gastrulation. Identical twins come from two secondary oocytes that are each fertilized in the same uterine cycle.