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1/21/2023
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6.6 Meiosis and Genetic Variation • Independent assortment and crossing over during meiosis result in genetic diversity Sexual reproduction creates unique combinations of genes O Independent assortment of chromosomes in meiosis O Random fertilization of gametes o Unique phenotypes may give a reproductive advantage to some organisms • Crossing over during meiosis increases genetic diversity O Crossing over is the exchange of chromosome segments between homologous chromosomes O O ■ Occurs during prophase 1 of meiosis 1 Results in new combinations of genes Chromosomes contain many genes The farther apart two genes are located on a chromosome, the more likely they are to be separated by crossing over Genes located close together on a chromosome tend to be inherited together, with is called genetic linkage Genitic linkage allows the distance between two genes to be calculated
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