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7 - alleles a 2 b 3 c 4 d 5 e 6 3(2 pts In birds sex is...

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Paull BIO 212 Problem Set #7 (14 pts) Due on March 24/25 Handout #7: extensions to Mendel, continued and human genetics 1. Feather color in budgies is determined by two different genes that affect the pigmentation of the outer feather and its core. Y-B- is green; yyB- is blue; Y-bb is yellow; and yybb is white. part 1: (2 pts) A blue budgie was crossed with a yellow budgie. Over the years, they produced 22 offspring, 5 of which were white. What are the most likely genotypes for the blue budgie and the yellow budgie? a. yyBb and Yybb b. yyBb and yybb c. yyBB and Yybb d. YyBb and YyBb e. yyBB and Yybb part 2: (1 pt) The inheritance of color in budgies in an example of what genetic phenomenon? a. incomplete dominance b. pleiotropy c. multiple alleles d. epistasis e. co-dominance 2. (2 pts) Color pattern in a species of duck is determined by one gene with three alleles. Alleles H and I are co-dominant, and allele i is recessive to both. How many phenotypes are possible in a flock of ducks that contains all the possible combinations of these three
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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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7 - alleles a 2 b 3 c 4 d 5 e 6 3(2 pts In birds sex is...

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