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Practise Questions Midterm II W2013

Assume the populations are located far from one

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Unformatted text preview: What is an important consequence of gene flow in natural populations? a. Gene flow increases the mutation rate among sedentary organisms. b. Gene flow moves individuals from one habitat to another on a seasonal basis. c. Gene flow tends to separate allele frequencies among populations. d. Gene flow tends to reduce genetic differences among populations. 21. Gene flow between organisms of ring species occurs a. between any of the organisms if they are placed in the same environment. b. never. c. only between intermediary populations. d. only under laboratory conditions. 22. Why is random genetic drift aptly named? a. It causes allele frequencies to drift up or down randomly. b. It is the ultimate source of genetic variability. c. It is an especially important mechanism in small populations. d. It occurs when populations drift into new habitats. 23. For the streamlined bodies shown in the diagram below to be homologous instead of analogous (due to convergent evolution), which of the following groups would you expect to also have to have streamlined bodies? a. Synapsids, monotremes, marsupials, rodents, primates & elephants. b. Lizards & elephants. c. Pterosaurs, dinosaurs, birds & lizards. d. All of the above (A- C). 24. There are 40 individuals in population 1, all of which have genotype A1A1, and there are 25 individuals in population 2, all of genotype A2A2. Assume the populations are located far from one another & that their environmental conditions are very similar. Based on the information given here, the observed genetic variation is most likely an example of a. Genetic drift b. Gene flow c. Disruptive selection d. Discrete variation e. Directional selection 25. An Eastern European immigrant carrying the allele for Tay Sachs disease settled in a small village on the St. Lawrence River. Many generations later, the frequency of the all...
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