How would one explain a testcross involving F₁ dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?
A) The two genes are closely linked on the same chromosome.
B) The two genes are linked but on different chromosomes.
C) Recombination did not occur in the cell during meiosis.
D) The testcross was improperly performed.
E) Both of the characters are controlled by more than one gene.

Question

Quizplus · Accepted Answer

If the two genes are closely linked on the same chromosome, they are less likely to undergo crossing over and result in recombinant-type offspring. This would lead to more parental-type offspring being produced in the testcross.

How Would One Explain a Testcross Involving F₁ Dihybrid Flies