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 will tend to be inherited together as a unit (i.e. they will not undergo crossing over and recombination), resulting in more parental-type offspring than recombinant-type offspring in the testcross.

How Would One Explain a Testcross Involving F1 Dihybrid Flies