01:119:115 Quiz: Lectures 20 and 21: Macroevolution and Microevolution Study Guide Organizers
1 Dec 2017
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23. 1 through 23. 4 compare and contrast sources of genetic and phenotypic variation. Mendelian traits: some phenotypes are either on or off , some are gradations: vary along a continuum (2+ genes influence a character) Sexual reproduction = recombination of old alleles: doesn"t create new alleles, mutations are the only source of new alleles, alterations in chromosomes, rapid (asexual reproduction) lots of mutations! apply the hardy-weinberg formulae to solve a population problem. Hardy-weinberg equilibrium: population"s frequencies of alleles will remain constant over time, continues as long as the population continues to mate randomly and no outside agents act on the population. Hardy-weinberg equation: p = frequency of the dominant allele (w) q = frequency of the recessive allele (w: p+q = 1 (100% of alleles, f(p) = 0. 5, f(q) = 0. 5. Probability of ww offspring = p*p = p^2. Probability of ww offspring = p*q = pq. Probability of ww offspring = q*q = q^2.
