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Evol_gen_problem_set_answers

# Evol_gen_problem_set_answers - Name BioEE 278 PROBLEM SET...

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Name _______________________ Section _________ 1 BioEE 278 PROBLEM SET Due: Return completed problem set in Section during the week of Oct 30 – Nov 1. Put your name and section on each page. Questions are worth 6 or 7 points, for a total of 25 points. Note that as of today (Oct 20), I have not covered all of the material that is required to answer the problems, but will have done so by Oct 25. Problem 1: You are interested in patterns of variation in a small terrestrial lizard that inhabits the Amazon basin. A single gene locus determines skin color in this animal: homozygotes for one allele (A1) are black, heterozygotes are gray, homozygotes for the second allele (A2) are white. A colleague in South America sends you data for 124 field-collected lizards with the following observed phenotypes. Color Number Black 56 Gray 39 White 29 Calculate allele frequencies and expected genotype frequencies for this sample. How do observed and expected numbers of genotypes differ? Does it appear that the lizard population is in Hardy-Weinberg equilibrium? p=freq(A1) = (112 + 39)/(2*(56+39+29) = 0.61 Black Gray White Expected number 124p 2 124*2pq 124*q 2 46 48 15 (Studences can also calculate actual and expected genotype frequencies) No, the population isn’t in H-W equilibrium. Upon closer inspection of your colleague’s field records, you discover that 64 of the lizards were collected from a small area on the north bank of the Amazon River; the remaining 60 lizards were collected on the south bank. Phenotypes for the two populations are: North South Color Number Color Number Black 8 Black 48 Gray 28 Gray 11 White 28 White 1 Calculate allele and expected genotype frequencies for the north bank and south bank “populations”. Is each of these populations in Hardy-Weinberg equilibrium? What do the data suggest about the biology of the lizards?

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Evol_gen_problem_set_answers - Name BioEE 278 PROBLEM SET...

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