Part B Benzer observed that two non-complementing mutants--two phages that both

Question

Part B

Benzer observed that two non-complementing mutants--two phages that both have mutations in the rIIA gene--could produce plaques on E. coli K12 () lawns at very low frequencies.

Which of the following statements is/are true based on this observation?

Select all that apply.

A. Recombination occurred within the rIIA gene. B. The coinfecting phages were not able to complement each other. C. The two mutant phages have mutations in different regions of the rIIA gene. D. Recombination occurred between the rIIA gene and the rIIB gene. E. No recombination occurred.

Explanation / Answer

The correct answer is (E) No recombination occurred

Recombination within a gene is rare because the mutations are close to each other.

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