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quiz-1_key - TAKE-HOME QUIZ KEY BIS 101D Fall 2009 Name 1...

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TAKE-HOME QUIZ KEY BIS 101D Fall 2009 N a m e : 1. If genes assort independently, a selfed dihybrid AaBb typically produces progeny phenotypes in a ratio (assume complete dominance): (2 pt) 9 : 3 : 3 : 1 2. If genes assort independently, a testcrossed dihybrid typically produces progeny phenotypes in a ratio (assume complete dominance): (2 pt) 1 : 1 : 1 : 1 3. If genes assort independently, a trihybrid Aa Bb Cc typically produces gametes with the following genotypes: (2 pt) ABC ABc AbC Abc aBC aBc abC abc 4. A couple are both heterozygous for two autosomal recessive diseases: cystic fibrosis (CF) and phenylketonuria (PKU). What is the probability that their first child will have either CF or PKU (not both)? (2 pt) CF = ¼ x ¾ = 3/16 PKU = ¾ x ¼ = 3/16 CF or PKU = 3/16 + 3/16 = 3/8 5. In guinea pigs B = black and b = brown. In one laboratory cross the records of the parents had been lost, but the progeny was all black. Certain pairs of progeny were mated repeatedly over a number of years, each cross producing numerous offspring. Some of
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quiz-1_key - TAKE-HOME QUIZ KEY BIS 101D Fall 2009 Name 1...

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