Sexual reproduction creates unique combinations of genes.

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Presentation transcript:

KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.

Sexual reproduction creates unique combinations of genes. Sexual reproduction creates unique combination of genes. independent assortment of chromosomes in meiosis random fertilization of gametes Unique phenotypes may give a reproductive advantage to some organisms.

Crossing over during meiosis increases genetic diversity. Crossing over is the exchange of chromosome segments between homologous chromosomes. occurs during prophase I of meiosis I 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, which is called genetic linkage. Genetic linkage allows the distance between two genes to be calculated.