Chapter 10 A Closer Look at Meiosis

Chapter 10 A Closer Look at Meiosis - Chapter 10 A Closer...

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Chapter 10 A Closer Look at Meiosis I. Octopus Sex and Other Stories A. Organisms that reproduce asexually can rely on chromosome duplications and mitotic cell divisions. B. Sexually reproducing organisms must prepare sex cells with reduced chromosome quantities so that fusion at fertilization will maintain the diploid chromosome number. II. On Asexual and Sexual Reproduction A. In asexual reproduction, one parent passes a duplicate of its genetic information to its offspring, which can only be genetically identical clones of the parent. B. In sexual reproduction, each parent contributes one gene for each trait. 1. Genes for each trait come in slightly different forms called alleles, originally produced by mutations. 2. Meiosis shuffles the alleles during gamete formation, and fertilization produces offspring with unique combinations of alleles. 3. The variation generated by sexual reproduction is the testing ground for natural selection and is the basis for evolutionary change. III. Overview of Meiosis A. Think “Homologues” 1. Meiosis begins with diploid (2n = 46) germ cells and produces haploid gametes (n = 23). a. In 2n cells there are two chromosomes of each type, called homologous
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chapter 10 A Closer Look at Meiosis - Chapter 10 A Closer...

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