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Midterm_II_2010.KEY_WHITE

# Midterm_II_2010.KEY_WHITE - EEMB 129 Midterm II 2010 Name...

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EEMB 129 Midterm II Name____________________________ 2010 Perm #___________________________ 1) In a very large population of beetles the following ratios were observed: 80% Golden-eyed (GG), 0% grey (Gg) and 20% green-eyed (gg). (14 pts total) a) What are the allele frequencies? (2 pts) freq G = freq (GG) + 1/2 * freq(Gg) = 0.8 + 1/2 * 0.0 = 0.8 freq g = 1-freq(G) = 1 - 0.8 = 0.2 b) Is the population in Hardy-Weinberg Equilibrium at this locus? Show your work or explain your reasoning. (3 pts) Exp GG = p 2 = 0.6 2 = 0.36, Exp Gg = 2*p*q = 2*0.6*0.4 = 0.48, Exp gg = q 2 = 0.4 2 = 0.16, No, the HW expectations are VERY different from expectations. At a second, unlinked locus, the following ratios were observed in the same sample of beetles: 64% horizontal striped (BB), 32% checker-board (Bb), 4% vertical striped (bb). c) What are the allele frequencies at this locus? (2 pts) freq B = freq (BB) + 1/2 * freq(Bb) = 0.64 + 1/2 * 0.32 = 0.8 freq b = 1-freq(B) = 1 - 0.8 = 0.2 d) Is the population in Hardy-Weinberg Equilibrium at this locus? Show your work or explain your reasoning. (3 pts) Exp BB = p 2 = 0.8 2 = 0.64, Exp Bb = 2*p*q = 2*0.8*0.2 = 0.32, Exp bb = q 2 = 0.2 2 = 0.04 Yes, the HW expectations are met exactly e) How can you explain the similarity or difference between the Hardy-Weinberg results for the two loci? (4 pts) There must be non-random mating at the G-locus (unlikely), differential migration at the G-locus, natural selection at the G-locus or an HUGE mutation rate at the G-locus 2a. (4 pts) In Neurospora , asci genotyped for a single gene can be classified as MI or MII. Explain the genetic difference between these two types of asci. MI asci have not had crossing over between the gene and the centromere while crossing over has occurred between the gene and the centromere in MII asci

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EEMB 129 Midterm II Name____________________________ 2010 Perm #___________________________ b) (6 pts) For an individual with the genotype Aa, draw an example of an MI ascus and two examples of MII asci. Be sure to label the genotype of all spores and the type of ascus.
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Midterm_II_2010.KEY_WHITE - EEMB 129 Midterm II 2010 Name...

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