A Wild-Type Strain (H⁺r⁺) of Phage T2 Was Mixed with a Double

question 24

Multiple Choice

A wild-type strain (h⁺r⁺) of phage T2 was mixed with a double mutant (hr) for host range (h) and rapid lysis (r) and used with a high multiplicity of infection to infect E. coli B. The progeny from the cross were titered (counted) on a mixture of E. coli B and E. coli B/2 strains. The following plaques were scored: hr,212; h⁺r,114; hr⁺,106; h⁺r⁺,188
What is the approximate recombination frequency for these two loci?

• A) 35%
• B) 24%
• C) 14%
• D) 11%
• E) 65%

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