Chapter 8 - Chapter 8 Meiosis and Sexual Reproduction I...

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Chapter 8: Meiosis and Sexual Reproduction I. Sexual versus Asexual reproduction II. Ploidy: How meiosis reduces (halves) the number (ploidy) of chromosomes III. Mechanisms of Meiosis: meiosis has two nuclear and/or cell divisions, meiosis I and meiosis II. Meiosis is a longer more complicated process than mitosis. Spermatogenesis can take a month to complete in human males and oogenesis can take decades to complete in human females. A. Meiosis I: the reduction division (nuclei go from diploid to haploid); most of the differences between meiosis 1 and 2 occur during meiosis 1. 1. Prophase 1: As in mitosis chromosomes condense, mitotic spindle forms, MTOC migrates, kinetochores form. Unlike mitosis, in meiosis homologous chromosome pairs are intertwined in synapsis, forming a tetrad. Non-sister chromatids of homologous pairs form points of attachment along their lengths called chiasmata. Exchange of genetic material, or crossing over, occurs at chiasmata.
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This note was uploaded on 04/26/2009 for the course BCOR 1010 taught by Professor Latier,jef during the Fall '07 term at Colorado.

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Chapter 8 - Chapter 8 Meiosis and Sexual Reproduction I...

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