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Multiple Pregnancy Fraternal Twins Identical Twins When two eggs are released from the ovaries and both are fertilized by different sperm, the resulting embryos have individual genetic characteristics - they look different and can be different sexes. When a fertilizes egg splits into two, the embryos are genetically indistinguishable. LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD