Question
Biology Question on Principles of Inheritance and Variation
In a genetic cross having recessive epistasis, F, phenotypic ratio would be
A
0.3791782407
B
15:1
C
0.3771296296
D
12:3: 1.
Answer
0.3771296296
Explanation
Solution
In a genetic cross having recessive epistasis, F, phenotypic ratio would be 9 : 3 : 4. The recessive epistasis is illustrated by coat colour in mouse, the coat colour is determined by A/a pair, recessive allele b is epistatic over A/a. Thus, in the presence of bb, both A and aa give the same phenotype (albino). The F, ratio is generally 9:3:4.