meiosis (reduction division) n. a type of cell division that produces four daughter cells, each having half the number of chromosomes of the original cell. It occurs before the formation of sperm and ova and the normal (*diploid) number of chromosomes is restored after fertilization. Meiosis also produces genetic variation in the daughter cells, brought about by the process of *crossing over. Meiosis consists of two successive divisions, each divided into four stages (see PROPHASE, METAPHASE, ANAPHASE, TELOPHASE). (See illustration.) Compare MITOSIS. —meiotic adj.

Prophase I leptotene


chromosome      centriole

cell membrane    nucleer membrane

zygotene  to pachytene

bivalent of homologous chromosomes 







of each pair goes to each pole








Metaphase II to Anaphaee II




Telophesa II

four h8ploid nuclei

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