Exam 3 - Exam 3 Name: TA: Figure 1. The relationship...

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Exam 3 Name: TA: Figure 1. The relationship between the number of genes and their effect on a particular quantitative trait, showing that few genes have a large effect and many genes have small effect. 1) The particular distribution of gene effects on a quantitative trait described in figure 1 typically yields one of the frequency distributions for the trait shown below. Circle the letter corresponding to the most typical distribution. 2) For a new allele that is selectively equivalent to all other alleles in a population, what is its probability of becoming fixed in a population? A) 1 – 1/(2N) B) 1 C) 0 D) 1/(2N) E) None of the above
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3) Assume you have a scenario in which a novel advantageous allele originates in a finite population. The allele then increases in frequency but the change in frequency ( p) fluctuates widely, ranging from positive values to negative values (see figure above). Of the possible mechanisms of evolution that combine to determine this particular trajectory of allele frequency over time, the one mechanism with little or no effect is A) migration B) mutation C) genetic drift D) selection 4) Assume you have a model of evolution for a single locus with two alleles in which there is heterozygote advantage, and the corresponding equation for average fitness (W) is 1 – p 2 s – q 2 t. If s = 0.67 and t = 0.67, draw what the fitness landscape looks like and note the equilibrium allele frequency. Make sure you note the fitness values when p = 0 and p = 1. 5) The following will decrease the effective population size relative to census size except A) recent establishment of the population B) unequal sex ratio C) fluctuations in population size D) overlapping generations E) variation in family size exceeding Poisson expectations
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This note was uploaded on 05/02/2008 for the course EBIO 3080 taught by Professor Martin during the Fall '07 term at Colorado.

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Exam 3 - Exam 3 Name: TA: Figure 1. The relationship...

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