BIOL 1001M W2013 MI (Feb. 6) Key

Reproductive success does not affect evolution in

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Unformatted text preview: B. Changes in the finches’ beaks occurred by chance mutation and when there was a good match between beak structure and available food, those birds had more offspring. C. There is more than enough food to meet all the finches’ needs so they don’t need to compete for food, and could evolve without constraint. D. Finches compete primarily with closely related finches that eat the same kinds of food and some may die from lack of food in the island environment. 21. No two people are genetically identical, except for identical twins. The chief cause of genetic variation among human individuals is A. B. C. D. E. New mutations that occurred in the preceding generation. Reshuffling of alleles in sexual reproduction. New mutations that arise during gamete production. Geographic variation within the population. Environmental effects. 22. Snorg shells vary: some are white and some are orange. Snorgs with orange shells produce more offspring than do those with white shells. The percentage of different shell colours remains stable in the study despite the fact that the small mammal that eats Snorgs prefers orange shells to white. Which of these statements might explain this observation? A. B. C. D. E. Fitness is primarily determined by shell colour in Snorgs. Reproductive success does not affect evolution in this species. Natural selection cannot preferentially select any of the shell colours. The white shells have evolved predator resistance and cannot be eliminated. Shell colour exhibits qualitative variation. 23. Mutations are generated A. B. C. D. E. in response to the challenges of the environment . as a result of chance. as a result of natural selection. as a result of damage or disease. in response to interactions with other species. 6 BIOL 1001 Midterm I W2013 vA 24. Which of the following conditions would not be susceptible to natural selection? A. B. C. D. An allele that codes for a dominant phenotype found in the homozygous state. An allele that codes for a dominant phenotype found in the heterozygous state. An allele that codes for a recessive phenotypes found in the homozygous state. An allele that codes for a recessive phenotype found in the heterozygous state. 25. In a population of fish, body colouration varies from a light shade, almost white, to a very dark shade of green. These fish are subject to predation from birds that live on the shore. If the stream environment included several areas of sandy, light ­coloured bottom areas and areas with lots of dark ­coloured vegetation A. Both the light and dark ­coloured fish would have a selectiv...
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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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