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  4. In a genetic cross having recessive epistasis, F, phenotypic ratio would be

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Q. In a genetic cross having recessive epistasis, F, phenotypic ratio would be

AIPMTAIPMT 1990Principles of Inheritance and Variation

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.