Question

Q01: In a breeding experiment a pure bred black rabbit was crossed with pure bred white one. All the F1

offspring were black.

(a) Explain this information by means of a genetic diagram.

(b) If the F1 generation were allowed to interbreed, what proportion of the F2 generation would be

expected to be heterozygous.

(c) If you were given a black rabbit, how would you attempt to find out whether it is heterozygous

or homozygous?

Answer 1

Ans: (c) Test cross will be done to identify the homozygous or heterozygous. In a test cross, the organism with an unknown genotype is crossed with the homozygous recessive genotype.

(a)

(b) 50% will be heterozygous. Among 4 offsprings two will be heterozygous.