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Exam2_2013KEY_FINAL_new_PDF

# As maternal greatgrandmother 25 points 0125

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Unformatted text preview: ferent phenotypes have different “reproductive success” or “fitness” – These phenotypic differences must reflect genetic and heritable differences among individuals – These conditions are necessary and also sufficient: if heritable variation in fitness is present evolution by natural selection will occur B. Quantitative questions. Please show your work and answer all parts of the question. 5. In a diploid, sexually reproducing population, calculate the average relatedness of an individual A, to these relatives (please show your work): a. A’s half sister (2.5 points) 0.25 b. A’s cousin (2.5 points) 0.125 c. A’s maternal great ­grandmother (2.5 points) 0.125 d. The aunt of A’s mother (great aunt) (2.5 points) 0.125 6. Given a single locus with two alleles A and a, allele A is dominant, and the environment suddenly favors the A allele. The allele A has a frequency of 0.5 and a has a frequency of 0.5 as a starting point. Exactly 50% of the aa genotypes die before reproducing. 4 ECOL 335 Evolutionary Biology NAME_____KEY________________ Sect#_____ Exam 2 Spring 2013 March 6, 2012 6a. What is the selection coefficient (s) against the aa genotype from the starting generation to the next (3 points)? What is s? s = 0.5 we know this because s = 1 ­ w22 6b. What is the frequency of A in the next generation of gametes (3 points)? Frequency of A in new gametes: p’= (p/(1 ­sq2) A = 0.5/(1 ­0.5*0.5) A = 0.67 6c. What is the mean fitness in the next generation (3 points)? Mean fitness: w bar (W) = 1 ­sq2 W = 1...
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