Lec59%20Pop%20Gen%2009 - 3/2/09 1 Population Genetics The...

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Unformatted text preview: 3/2/09 1 Population Genetics The Hardy-Weinberg principle is valid only under certain conditions. Which of the following is not one of those conditions? A) no mutations B) selection of favorable mates C) no natural selection D) extremely large population size E) no gene Fow The Hardy-Weinberg principle is valid only under certain conditions. Which of the following is not one of those conditions? A) no mutations B) selection of favorable mates C) no natural selection D) extremely large population size E) no gene Fow * Natural variation Most individuals (plant, animal, etc) are heterozygous at 4-15% of their genetic loci Populations (localized group of interbreeding individuals) of a species may differ. Variation often occurs along a graded geographic axis (cline). Whitetail deer in lorida keys and Saskatchewan requency of an allele that codes for an enzyme that works better in the cold New alleles arise due to mutations can be a single nucleotide (point mutation), or insertions (often transposable elements), or deletions Larger scale alterations. chromosome translocations, inversions and fusions are common Mutations are often neutral, but may be deleterious or, more rarely, benecial mutations in somatic cells are not passed from one generation to another new apple cultivars are sometimes sports that are propagated by grafting Mutations are shufFed by: independent assortment crossing over different mating combinations 3/2/09 2 Evolution is change in allele frequency over generations Analyzing allele frequencies C R C W X C R C W C R C W C R C R C R C R C W C W C R C W C W C W Out of 500 plants, 320 are red, 160 pink, 20 white How many alleles of each type?...
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This note was uploaded on 10/20/2009 for the course BIO G 1102 taught by Professor Walcott during the Spring '08 term at Cornell University (Engineering School).

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Lec59%20Pop%20Gen%2009 - 3/2/09 1 Population Genetics The...

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