Solutions For An Introduction to Genetic Analysis Chapter 5 Problem 43P

The metF⁺ colonies that are now also argC¯ are the result of cotransduction of the two markers from the donor strain. This will be less likely than transduction of just the metF⁺ allele, and in these cases, the recipient remains argC⁺.

The following diagram illustrates the possible recombination events that will result in metF⁺ transductants that remain argC⁺:

The following diagram illustrates the possible recombination events that will result in metF⁺ transductants that are also now argC¯: