Practise Questions Jan. 2012 Key

In one population individuals of genotype aa are most

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Unformatted text preview: ns. b. Drift is greatest in small populations. c. Drift is greatest in migrating populations. d. Drift is greatest in fixed populations. 42. Why is 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. 43. Suppose 2 plant populations exchange pollen & seeds. In one population, individuals of genotype AA are most common (9 000 AA, 900 Aa, 100 aa), while the opposite is true in the other population (100 AA, 900 Aa, 9 000 aa). If neither allele has a selective advantage, what will happen over time to the allele & genotype frequencies of these populations? 44. 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 PRACTISE QUESTIONS BIOL 1001 W2012 Key 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 45. Which of the following biological processes causes adaptation? a. mutation b. migration c. natural selection d. genetic drift 46. Which of the following statements is correct? a. Evolution by natural selection is not progressive. It is random. b. The largest, strongest & most dominant individuals in a population produce the most offspring. c. In 1977, individual finches on the Galapagos adapted to drought conditions & passed these traits on to their offspring. d. None of the above statements are correct....
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This test prep was uploaded on 02/20/2014 for the course BIOLOGY 1001 taught by Professor Tamarakelly during the Spring '13 term at York University.

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