9. In the F2 generation, a 9:4:3 phenotypic ratio results from: a) codominance-t
ID: 3512645 • Letter: 9
Question
9. In the F2 generation, a 9:4:3 phenotypic ratio results from: a) codominance-two gene pairs b) complete dominance-one gene pair c) lethality d) epistasis-two gene pairs e) epistasis-three gene pairs 10. The percentage of individuals that show at least some degree of expression of a mutant phenotype is: 0 d) expressivity penetrance b) recessiveness c) always 100% 11. In Drosophila, normal wing is dominant to vestigial wing. This trait is carried on an autosome. If in the P1 vestigial wing flies were crossed to homozygous wild type flies, and the Fl flies were crossed to homozygous vestigial wing flies, the offspring would be: G 3/4 normal wing: 1/4 vestigial wing b) 1/2 normal wing: 1/2 vestigial wing c) 1/2 normal wing females: 1/2 vestigial winged males d) 3/4 vestigial wing: 1/4 normal wing IE two carriers marry and have two children, what is the probability that both would be healthy? 12. Cystic fibrosis is inherited as an autosomal recessive trait. a) 3/4 b) 1/4c) 1/16 d) 9/16 e) 6/16Explanation / Answer
9.d. epistasis- two gene pairs.
In a cross AABB× aabb, F2 progeny is produced in a phenotypic ratio of 9:4:3
10.a.penetrance .
11.a.3/4 normal wing:1/4 vestigial wing.
12.a.3/4.
Probability would be 3/4 as because both are carriers.
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