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| Modern Genetic Analysis Chapter 4. The Inheritance of Genes Cell Division Figure 4-9. DNA and gene transmission during asexual and sexual cell divisions in eukaryotes. S phase and the main stages of mitosis and meiosis are shown. The diagrams emphasize the DNA content of each cell and chromosome. The first two panels in each column show DNA replication, which occurs during the S phase; the remaining panels show mitosis or meiosis. The alleles A and a of one gene are used to show how genotypes are transmitted during cell division. (The A and a designations will be used to represent generic alleles in the rest of the chapter.)

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