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Unformatted text preview: alleles? a. 2 b. 3 c. 4 d. 5 e. 6 3 . (2 pts) In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pidgeons. What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female? a. 2:1 male to female b. 1:2 male to female c. 1:1 male to female d. 4:3 male to female e. 3:1 male to female 4. Red-green color blindness is caused by an X-linked recessive allele. A color-blind man marries a woman with normal vision whose father was color-blind. a. (2 pts) What is the probability that they will have a color-blind daughter? b. (2 pts) What is the probability that their first son will be color-blind? 5. (3 pts) For each of the pedigrees shown below, state the most probable genetic form of inheritance: autosomal dominant, autosomal recessive, X-linked dominant, or X-linked recessive. a. b. c....
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