December Test Answer

December Test Answer - December 09 Bio 1223 Comments Page 1...

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Unformatted text preview: December 09 Bio 1223 Comments Page 1 of 10 Student number _______________________ Code 000 Code 000 Code 000 Code 000 These questions may be shuffled in a different order on your code. Find which question each refers to on your code. 1. Which of the following statements is supported by modern evolutionary theory? A. The earth is more than 6,000 years old. 4.5 billion years old B. Natural selection preserves adaptive traits while genetic drift eliminates them. Genetic drift eliminates any allele, not just adaptive ones C. All newborn offspring are not well adapted to their present environment. D. Giraffes that stretch their necks more often for food will have offspring with longer necks than offspring from giraffes that do not stretch their necks. Lamarckian is wrong E. H-W equilibrium is only a theory that is never actually realized in natural populations. Many traits show no selection for or against them (neutral features) 2. Which of the following statements about the Hardy-Weinberg Equilibrium is correct ? A. If a population is in H-W equilibrium, then all genotypes for a trait have the same average fitness. B. If a population is in H-W equilibrium, then all genotypes for a trait are equally frequent. C. If a population is in H-W equilibrium, then we can predict the current genotype frequencies from the current allele frequencies for a trait. p 2 + 2pq = q 2 = 1 D. If a population is not in H-W equilibrium, we cannot can calculate the current allele frequencies from the current genotype frequencies for a trait. p + q = 1 is always true E. If a population is not in H-W equilibrium, then (p + q) is less than 1 for a trait. 3. Imagine a population of field mice, in which coat colour is determined by the B locus: BB mice are dark brown, Bb mice are light brown, and bb mice are white. After a winter storm, BB and Bb individuals are very conspicuous against the snow, and most are eaten by owls. White mice are much better camouflaged, so most bb individuals survive and reproduce. Which of the four postulates of natural selection does this example illustrate? 1. Individuals vary with respect to a trait. Three phenotype 2. Variation is at least partially heritable. Coat colour determined by one gene, the B locus 3. Some individuals are more successful than others at surviving or reproducing. bb better camouflaged 4. Differences in survival or reproduction are related to variation in the trait. BB and Bb eaten by owls A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. 1, 2, 3 and 4 are correct 4. In a particular population of 1000 people, blood tests show that 100 people have the genotype I A I A , 540 have the genotype I A i and 360 have the genotype ii . What is the frequency of the I A allele in this population?...
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Fall '09 term at UWO.

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December Test Answer - December 09 Bio 1223 Comments Page 1...

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