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hmwk2_12 - Fall 2012 Due 9/7 GENETICS Homework 2 1(1point A...

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Fall 2012 Due: 9/7 GENETICS Homework 2 1. (1point) A woman is affected with a trait due to a dominant mutant allele that shows 50% penetrance. If she has a child, what is the probability that it will be affected? 2. (1 point) In a maternity ward, four babies become accidentally mixed up. The ABO types of the four babies are known to be O, A, B, and AB. The ABO types of the four sets of parents are determined. Indicate which baby belongs to each set of parents: a) AB X O, b) A X O, c) A X AB, d) O X O 3. (2 points) In the guinea pig, one locus involved in the control of coat color may be occupied by any of four alleles : C(black), c k (sepia), c d (cream), or c a (albino), where the order of dominance is C > c k > c d > c a . In the following crosses, write the parental genotypes and predict the phenotypic ratios that would result: a) sepia X cream, where both guinea pigs had an albino parent b) sepia X cream, where the sepia guinea pig had an albino parent and the cream guinea pig had two sepia parents c) sepia X
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