Two Different Strains of a Mutant Phage Infected a Single

question 4

Multiple Choice

Two different strains of a mutant phage infected a single bacterium.One phage strain is a^-b⁺ and the other is a⁺b^-.The coinfected phages produced the wild-type phenotype in the bacterium: progeny phages were diluted and plated on a bacterial lawn.The resulting plaques produced the following genotypes: 19 a⁺ b⁺, 31 a^-b⁺, 29 a⁺b^-, 21 a^-b^-.What is the recombination frequency between the a and b genes?

• A)10%
• B)20%
• C)30%
• D)40%
• E)50%

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