A human population has a has a higher-than-usual percentage of individuals with

Question

A human population has a has a higher-than-usual percentage of individuals with a rare genetic disease. The most likely explanation is: a. Gene flow b. Stabilizing selection c. Directional selection d. Genetic drift e. All of the preceding Which of the following did NOT occur to Darwin on the voyage of the Beagle? a. He read Lyles Principles of Geology b. He observed living animals and similar fossils c. He read Malthus' Essays on Population d. He witnessed an earthquake and the resulting fault e. All of the above DID occur on the voyage. The genetic variations necessary for natural selection a. are usually harmful. b. are controlled by the environment. c. result in mutations. d. can be caused by recombination during meiosis. e. all of the above are true.

Explanation / Answer

23. d) Genetic drift (Explanation - Genetic drift is the change in the frequency of different genotypes in an existing small population.)

25. d) can be caused by recombination during meiosis. (Explanation - Natural selection requires genetic variation in order to give rise to characters that are better suited in the nature - those who can survive better than the others. So it is never harmful. Genetic variation is also not controlled by the environment. It occurs due to mutation and not vice versa. Mutation occurs first which results in genetic variation. Recombination between chromosomes during meiosis causes reshuffling of the alleles within the organism that is in the making. Therefore, genetic variations necessary for natural selection can be caused by recombination during meiosis.)

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