This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: The webquiz next week will be posted on TUESDAY instead of Monday. There is no webquiz this week. Population Genetics Natural variation in populations 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). W hitetail deer in Florida keys and Saskatchewan Frequency of an al ele 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, beneficial mutations in somatic cells are not passed from one generation to another new apple cultivars are sometimes ‘sports’ that are propagated by grafting 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 flow 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 flow * Mutations are shuffled by: • independent assortment • crossing over • different mating combinations 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?How many alleles of each type?...
View Full Document
- Spring '10
- Population Genetics, R.C. Punnett