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15 a small population of ding-bats consists of only 5

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Unformatted text preview: 15) A small population of Ding-bats consists of only 5 individuals. Their genotypes at the C-locus are listed below: C 1 C 2 , C 2 C 2 , C 1 C 1 , C 1 C 1 , C 1 C 2 The frequency of the C 1-allele in the gene pool is : a) 10%; b) 20%; c) 40%; d) 60%; e) none of these choices. 16) Consider the life cycle of the HIV virus. The drug ΑΖΤ influences which step in the life cycle? a) copying of HIV’s DNA into RNA d) the protease reaction b) copying of HIV’s RNA into DNA e) entry of the virus into the cell. c) integration of the HIV chromosome into the host’s chromosomes 17) The HIV virus adapts to AZT by: a) Preferentially using thymidine (T) instead of AZT during reverse-transcription; b) evolving to evade the “protease/cocktail” therapy of drugs c) Integrating into more locations in the helper-T cell’s genome d) Evolving to bypass the reverse-transcription process e) Evolving to using a different receptor to enter helper-T cells. 18) Compared to other pathogens, the major reason that HIV is not eliminated by the human immune system is: a) HIV reproduces rapidly because of its fast generation time d) HIV is too small b) HIV evolves rapidly because of its high mutation rate e) none of these choices. c) HIV does not induce antibodies; 19) Chemicals used to control agricultural pests and bacteria can lose much of their effectiveness over time. This loss of effectiveness occurs due to what process by the pests and bacteria: a) gradual evolution of resistance over a period of about 100 years b) a gradual physiological response over a period a few months c) rapid evolution of resistance over a period of a few years or decades d) a rapid physiological response over a period of a few days e) none of these choices. 20) The major factor that leads to a new pandemic of influenza in humans is: a) microevolution within the gene pool of the virus b) Double-infection of a farm animal with viruses from humans and from a farm animal or bird c) lack of immunity in the human population to a radically new, hybrid virus genome d) poor hygiene e) Both answers b & c are correct. Three genotypes (A,B,C) of an annual, asexual fish were released as eggs into a pond during the Spring of 2000 as described in the table below. To simplify your analysis, you can assume that each genotype represents a single gene, as we did in class. The next spring the eggs of the next generation were scored as reported in the table below. Genotype Number eggs released in 2000 Number eggs observed next generation A 50 200 B 400 400 C 50 150 21) The Darwinian fitness of genotype A is: a) 0.5 d) 4 b) 1 e) 200 c) 2 22) The relative fitness of genotype B is: a) 0.25 d) 0.9 b) 0.5 e) 1.0 c) 0.75 23) The frequency of the C gene in the gene pool in year 2000 is: a) 0.1 d) 0.9 b) 0.2 e) 1.0 c) 0.5 24) If the three genotypes (A,B, and C) had been placed in a different pond in a different location, the genotype with the highest fitness would be: a) A d) too little information to be able answer this question...
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15 A small population of Ding-bats consists of only 5...

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