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| Description: (a) Monozygotic (MZ) twins result from the fertilization of a single egg by a single sperm. After one or more mitotic divisions, the embryo splits in two and forms two genetically identical individuals. (b) Dizygotic (DZ) twins result from the independent fertilization of two eggs by two sperm during the same ovulatory cycle. Although these two embryos simultaneously occupy the same uterine environment, they share only about half of their genes. Monozygotic (MZ) twins Single fertilization event * Mitosis [CD 0 o (a) Two genetically identical embryos l CD (b) Mitosis Dizygotic (DZ) twins l (D Two independent fertilization events Two embryos sharing about half their genes © Cengage Leammg Picture Stats: Views: 175 Filesize: 88.39kB Height: 584 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=44183 |