Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 47P

a) Since the cross is WW ee FF x ww EE ff, the F₁ progeny would be W e F/w E f. when this F₁ is testcrossed, the proportion of progeny that will be ww ee ff can be explained in this way:

To have the genotype of ww ee ff, one of the double crossover recombinant chromosomes need to be inherited. Since we can assume no interference, the expected percentage of double crossovers would be:

Since this is the total percentage of double crossovers, the percentage of progeny with the genotype of ww ee ff would be 0.96%.

b) When the F₁ is selfed, the proportion of progeny, which will have the genotype of ww ee ff can be calculated in this way:

To have the genotype of ww ee ff, two of the double crossover recombinant chromosomes need to be inherited. The percentage of progeny with the ww ee ff genotype based on (a) answer would be:

This would be the percentage of the recombinant progeny. Taking 100 as the total progeny: