Exam2_2013KEY_FINAL_new_PDF

As maternal greatgrandmother 25 points 0125

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 02/02/2014 for the course ECOL 335 taught by Professor Reinthal during the Spring '10 term at University of Arizona- Tucson.

Ask a homework question - tutors are online