How Would One Explain a Testcross Involving F₁ Dihybrid Flies

question 42

Multiple Choice

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.

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