Question

In case of dominant epistasis which of the following will have the same expression, when A is the epistatic locus?

(a) A/a B/b and a/a B/b

(b) A/A b/b and A/A B/b

(c) a/a b/b and A/a b/b

(d) a/a b/b and a/a B/B

I have been asked this question by my school teacher while I was bunking the class.

I need to ask this question from Epistasis in division Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

The correct choice is (b) A/A b/b and A/A B/b

For explanation I would say: According to the description of dominant epistasis given, A is the epistatic locus, thus presence of even one set of dominant gene at A locus will give the same effect irrespective of the B locus.