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Meiosis160-page11 - (Prophase I produces gametes with...

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Meiosis and Life Cycles - 11 Review of Genetic Importance of Meiosis To conclude our discussion of meiosis, and to initiate further discussion of genetics and inheritance let us recall that the genetic traits we inherit are in the form of gene alternatives, called alleles. These alleles are located on the homologous chromosomes. The zygote receives different parental combinations of homologs from the egg and sperm. How these alternatives get expressed is the study of inheritance. Meiosis plays the following roles in inheritance: Recombination or crossing-over between non-sister chromatids during synapsis
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Unformatted text preview: (Prophase I) produces gametes with greater variation. • The independent assortment (or alignment) of maternal and paternal chromosomes at Metaphase I when homologous chromosomes are lined up on the cell equator results in greater genetic variation. For example, with just three pairs of homologous chromosomes, you can have eight different haploid combinations. • The fusion of genetically different gametes results in new genetic combinations for each generation. • Meiosis provides a mechanism to preserve chromosome number from generation to generation....
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