Question

The cross between a white mouse and a black mouse _______________

(a) Can’t give a Black mouse

(b) Can’t give a White mouse

(c) Can’t give a Agouti mouse

(d) Can give all combinations

This question was posed to me in examination.

This is a very interesting question from Epistasis topic in chapter Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

Correct answer is (d) Can give all combinations

The best explanation: Agouti gene is hypostatic to the color locus, in black mouse the combination is a/a C/- and in albino or white it’s -/- c/c. So if there is any dominant agouti gene in white mouse it can be expressed in the F1 where C locus would be C/-, so all combinations are possible.