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Chpt_13_MEIOSIS - Meiosis A Meiosis mechanism for making...

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Meiosis A. Meiosis- mechanism for making sperm and ova. 1. sexual reproduction requires gametes with half the # of chromosomes of the species 2. gametes join to produce an new organism with the correct number and kind of chromosomes of the species. -Genes are transferred from parent to offspring ‘like begets like’ ‘more or less’ -More or less because sexual reproduction introduces genetic variety. B. Sexual reproduction is a mechanism for ensuring genetic variation 1. Genetic variation ensures survival of the species, since in times of environmental stress, at least some are likely to survive a. the union of a sperm and
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and egg produce a unique genetic combination in the offspring. (1) offspring of sexual reproduction vary genetically from their parents and siblings 2. Asexual reproduction (mitosis, binary fission) produces organisms that are genetically identical a. except when a mutation occurs.(a change in the genes) b. mutations are random and can be harmful, nonsense, or on occasion beneficial C. Meiosis reduces chromosome # from
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