Biology October-20-08

Biology October-20-08 - Biology 08 October-20- NOTE: THIS...

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Biology October-20-08 NOTE: THIS LECTURE IS NOT ON OCTOBER MIDTERM! Meiosis and Genetic Recombination Inheritance of difference: - Mutations that give rise to different versions of a given gene - allele - Homologous chromosomes may carry different alleles for any given gene - In meiosis I, homologous pair and then segregate to different daughter cells - Independent assortment of alleles on homologues at metaphase of meiosis I generates diverse combinations of alleles (when the homologues form the metaphase plate) - “cut/switch/paste” recombination during meiosis creates chromatids with novel DNA sequences. - Independent alignment of recombined chromosomes at Meiosis II gives many combinations, random fertilization of gametes generates immense diversity of zygotes. This may cause fatal mutations to be “removed” when the recombination occurs.
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Sexual reproduction recombination: - Sexual eukaryotes bring homologous haploid parental genomes into close proximity in a diploid zygote - Recombination during meiosis yields cells with different DNA sequences than carried by
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Biology October-20-08 - Biology 08 October-20- NOTE: THIS...

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