Problem Set #3 KEY BICD 100 W’ 08 (L. Smith) Note: pedigrees omitted from key to save paper - see original problem set for pedigrees 1.) The following pedigrees show the pattern of inheritance for two different, rare traits in human families. Indicate for each the likely mode(s) of inheritance (autosomal recessive, X-linked recessive, autosomal dominant, X-linked dominant, or maternal inheritance… if two or more are both likely, so state). First one: X-linked recessive. Second one: maternal inheritance and autosomal dominant are both likely (if autosomal dominant, we expect that 1/2 the progeny of all affected individuals will be affected – here we see that of 11 progeny of affected individuals, 6 are affected). 2.) In Drosophila (fruit flies), miniature wings results from an X-linked recessive mutation, w. Sepia eyes results from an autosomal recessive mutation, s (wild-type eye color for fruit flies is red). a. A female fly with miniature wings and sepia eyes is crossed to a true-breeding wild-type male (normal
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