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Reproduction and Chromosome Transmission

For a single diploid cell entering meiosis the end

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Unformatted text preview: osis II. For a single diploid cell entering meiosis, the end result is four haploid daughter cells. These daughter cells vary in their genetic composition. In animals, spermatogenesis produces four haploid sperm cells and oogenesis produces a single haploid egg cell (Figure 3.14). In male animals, the formation of the sperm, called spermatogenesis, occurs in the testes. In the testes a spermatogonial cell divides by mitosis to produce two identical cells. One of these is a spermatocyte and enters into meiosis, while the other remains a spermatogonial cell. The four haploid cells produced by meiosis mature into sperm cells. Each sperm cell contains a haploid nucleus, an acrosome that contains digestive enzymes, and a long flagellum. Oogenesis is the formation of the egg cells. It begins with oogonia located in the ovary of the female. The oogonia begin meiosis, but are arrested at prophase I. After the female reaches a reproductive age, the primary oocytes are periodically activated. Unlike spermatogenesis in males, oogenesis only produces a single e...
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