Biology: A Guide to the Natural World with mybiology" (4th Edition)

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KroghS11.07 Mitosis February 14, 2011 Lecture 7: Cellular and Sexual Reproduction I. Sexual Reproduction A. Two haploid cells fuse together to begin a new multicellular organism B. Enhances genetic diversity within the population II. What is a Chromosome? A. A DNA molecule physically supported by proteins Fig. 9.6 B. Found in the nucleus of the cell C. Chromosomes occur in Homologous Pairs Fig. 9.7 1. The chromosomes of each pair contain genes for the same traits 2. One chromosome of each pair came from one parent, the other from the other parent—therefore we have two genes for each trait 3. The two genes for each trait may contain two different alleles, or hold the same allele D. Different ways chromosomes appear Fig. 9.6, 9.8 1. As chromatin—a diffuse mass of DNA and protein in the nucleus of the cell 2. As a replicated chromosome made up of two chromatids a. Each chromatid has the identical DNA sequence b. The two chromatids are the products of DNA replication c. This is the appearance of chromosomes just before Mitosis
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Topic7.1-CellularReproduction - KroghS11.07 Mitosis...

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