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Article: Meiosis
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- Biology
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CopyrightCOPYRIGHT 2002 The Gale Group Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Meiosis
Meiosis is the two-step series of specialized cell divisions that makes sexual reproduction possible. Meiosis produces
haploid
cells, which contain just one member of every
chromosome
pair characteristic of an organism. In all animals, specialized cells in the reproductive organs, called germ cells, undergo meiosis to produce haploid
gametes
(sperm and egg), which then fuse during sexual reproduction to create new
diploid
embryos. For example, human gametes are haploid and contain twenty-three different chromosomes. All other cells in the human body are diploid, containing two versions of each chromosome for a total of forty-six. Fusion of gametes to form a new embryo ...