quiz 3

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Feb 20, 2024

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YOUR NAME: Cira Polcari ZOOL 690 Section: MWF 8:10 Quiz 3 1. Do you agree with the following statement? Explain as fully as you can. (4 pt) Each new mutation arising in a cell, by its very occurrence, yields evolutionary change. I somewhat agree with this statement. New mutations in cells do have the potential to cause and or contribute to evolutionary change. But not all mutations are necessarily significant enough to cause noticeable evolutionary change. There are many different types of mutation and evolution is a slow process. The impact of the mutations depends on the pressures acting on the population. I hope I answered this correctly. 2. Which theory of molecular evolution predicts the highest ratio of mutations that affect fitness (i.e., survival and reproduction) to mutations that do not affect fitness (fitness-related mutations:non-fitness-related mutations)? Choose one . (1 pts) a. flow-directed b. mutational c. neutral d. selectionist e. Survivalist 3. False or True ? (circle one) William Paley’s ‘watchmaker’ argument (as told by Coyne, 2009) argues that nature is like a watchmaker and evolution is like a watch that nature has made. Therefore, there is no need to invoke the existence of a supernatural entity or god. (1) 4. If a population currently has NO genetic variation [i.e., every individual has the same allele for a given gene], which of the following might allow the population to evolve? Circle all that apply . (2 pts) a. gene flow b. mutation c. none of the above; if a population has no genetic variation, it cannot possibly evolve.

5. When two populations are experiencing reciprocal gene flow (bi-directional migration and reproduction), which of the following is the most likely outcome? Circle the one best answer. (2 pts) a. The allelic composition of the populations will become more and more different from one another (= they will diverge). b. The allelic composition of the populations will become more and more similar to one another (= they will homogenize). c. The populations will become nearly neutral. d. The populations will go extinct. e. The populations will mutate.

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