BB lecture 1-23-09, genetic variation, Mendel

BB lecture 1-23-09, genetic variation, Mendel - Property...

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Unformatted text preview: Property Mitosis Meiosis DNA replication During interphase During interphase Divisions One Two Synapsis and crossing over Do not occur Form tetrads in prophase I Daughter cells, genetic composition Two diploid, identical to parent cell Four haploid, different from parent cell and each other Role in animal body Produces cells for growth and tissue repair Produces gametes Chapter 13 continued Learning objectives Predict the gametic results of nondisjunction during meiosis. Describe three main mechanisms of genetic diversity. Understand the significance of sexual reproduction in the context of evolution. What if? Effect: No normal gametes Effect: 50% normal gametes Origins of Genetic Variation Among Offspring Three Main Mechanisms : 1. Independent assortment of chromosomes 2. Crossing over 3. Random fertilization Origins of Genetic Variation Among Offspring Three Main Mechanisms : 1. Independent assortment of chromosomes Fig. 13-11-1 Possibility 1 Possibility 2 Two equally probable arrangements of chromosomes at metaphase I Independent assortment of chromosomes Fig. 13-11-2 Possibility 1 Possibility 2 Two equally probable arrangements of chromosomes at metaphase I Metaphase II Independent assortment of chromosomes Fig. 13-11-3Fig....
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BB lecture 1-23-09, genetic variation, Mendel - Property...

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