Principles of Inheritance and Variation Question 111
111. In a genetic cross having recessive epistasis, $F_2$ phenotypic ratio would be
(a) $9: 6: 1$
(b) $15: 1$
(c) $9: 3: 4$
(d) $12: 3: 1$
Show Answer
Answer : c
Hints & Solution
(c) In recessive epistasis, the recessive alleles suppress the expression of a trait. Recessive epistasis is a type of intergenic interaction in which one non allelic gene can produce its effect independently in the dominant state but second gene can produce its effect when they are present together. Here homozygous recessive allele for a gene mask the expression of dominant allele of another gene.
