Which of the following ratios indicates an epistatic interaction
( select all that apply! )
a. 3: 1
b. 9: 7
c. 9: 3: 4
d. 9: 3: 3: 1

C. 9:3:4

Explanation:

F2 9:3:4 phenotypic ratio demonstrates recessive epistatic interaction. Here, recessive allele of one gene masks the effect of another gene. Suppose the two genes are A and B. Let their recessive counterparts be a and b. If "a" masks the effect of both B and b, it means that the two genes are showing recessive epistatic relationship. So the phenotype ratio would change from 9:3:3:1 to :

A_B_ = phenotype 1 = 9

A_bb = phenotype 2 = 3

aaB_ = phenotype 3 = 3

aabb = phenotype 3 = 1

Hence, the final ratio would be 9:3:4. Coat colour of labrador shows 9:3:4 ratio.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: