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Unformatted text preview: Biology 325H Tuesday 9:00-10:00 Quiz 3 1. In guinea pigs, the B locus determines fur color, with black being dominant to white. The L locus determines fur length, with long fur being dominant to short fur. A. [2 pts] A guinea pig with short black fur is mated to a guinea pig with long white fur. They have numerous offspring, all of which have long black fur. What is the most likely genotype for each of the two parents? short black = BB ll long white = bb LL B. [2 pts] A pure-breeding guinea pig with long black fur is crossed to a purebreeding guinea pig with short white fur. For the F 2 generation, describe the phenotypes you would expect to see and the ratio in which they should occur. 9 long black ( B- L- ) 3 long white ( bb L- ) 3 short black ( B- ll ) 1 short white ( bb ll ) 2. [1 pt.] Suppose that a husband and wife are both heterozygous for a recessive allele for albinism. If they have dizygotic twins ( i.e. from two different fertilized eggs), what is the probability that both twins will be albino? Each child has a 3/4 chance of normal skin coloration and a 1/4 chance of albinism....
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