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General Biology10Meiosis

General Biology10Meiosis - General Biology Chapter 10...

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General Biology Chapter 10 Meiosis 1. Meiosis occurs in haploid cells or gametes. Haploid cells have half the complement of chromosomes (n = 23 chromosomes). When two haploid cells fuse together (fertilization) they form a single diploid cell (2n = 46 chromosomes) called a zygote. Somatic cells are all cells not including the sex cells. Each of the human somatic cells are diploid cells and therefore in the normal state contain a compliment of 46 chromosomes. 2. Meiosis occurs in two phases; Meiosis I and Meiosis II. Meiosis II is essentially the same process as mitosis. 3. Meiosis I Prophase I: homologous chromosomes pair up to form tetrads. The homologous chromosomes undergo crossover (chiasma) in which portions of their nonsister chromatids are exchanged. This exchange will eventually result in genetic diversity. Metaphase I: The homologous chromosomes line up at the metaphesial plate. Spindle fibers are attached to the outer-facing kinetochore proteins of each homologue.
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