In a test cross involving F₁ dihybrid flies, more parental-type offspring were… | Linkage and Recombination

In a test cross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates

In a test cross involving $F_1$ dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates

A chromosomes failed to separate during meiosis.

B the two genes are linked and present on the same chromosome.

C both of the characters are controlled by more than one gene.

D the two genes are located on two different chromosomes.

Explanation

Excess parental types indicate linkage.

In a test cross, when parental types exceed recombinant types, it is because the two genes are linked and located on the same chromosome.

4 questions from this chapter have appeared across 4 exam years.