PCB 4674: Exam 2 Module Quizzes
Which of the following scenarios would provide evidence that an allele has experienced a selective sweep in the recent past? - [ANSWER] The allele is at high frequency and linkage disequilibrium with surrounding loci is high If a population of gall flies occurred in an area where birds were present but parasitoid wasps were absent, which type of selection would you expect to affect gall size? - [ANSWER] Directional Studies of mice inhabiting Gulf and Atlantic coastal showed - [ANSWER] NONE OF THESE • Both have darker coats than mainland mice • Coat color differences in coastal mice were caused by mutations to the same gene • Darker mice were less likely to be preyed upon than lighter mice in coastal habitats In 1977, before the drought on Daphne major, the average beak depth in the finch population was 9.2 mm. Breeding parents that survived the drought had an average beak depth of 9.7 mm. The difference between these values represents: - [ANSWER] The selection differential (S) The synonymous substitution rate is often assumed to represent - [ANSWER] The rate of evolution by genetic drift Which of the following scenarios would be most likely to produce a gene tree that is discordant with a species tree - [ANSWER] Short branch lengths, long coalescence time for alleles Which of the following is supported by molecular phylogenetic studies - [ANSWER] Lobe finned fish are more closely related to humans than to other fish Proponents of the Neutral theory of molecular evolution believe that most substitutions are fixed by - [ANSWER] Genetic drift Synonymous mutations ___. The rate of synonymous substitutions in a gene serves as an estimate of the rate of ___. - [ANSWER] Do not change the amino acid sequence of the protein; neutral evolution by genetic drift Female stickleback prefer males with bright red coloration on their belly. Given the result depicted in the graph below, it appears that females that choose redder males benefit from - [ANSWER] Good genes The graph above shows the relationship between the number of mates and the average number of offspring for males of two different species. Considering this graph: - [ANSWER] Sexual
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