Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 13

Three autosomal genes are linked along the same chromosome. The distance between gene A and B is 7 mu, the distance between B and C is 11 mu, and the distance between A and C is 4 mu. An individual who is AA bb CC was crossed to an individual who is aa BB cc to produce heterozygous F 1 offspring. The F 1 offspring were then crossed to homozygous aa bb cc individuals to produce F 2 offspring
a. Draw the arrangement of alleles on the chromosomes in the parents and in the F 1 offspring
b. Where would a crossover have to occur to produce an F 2 offspring that was heterozygous for all three genes
C. If we assume that no double crossovers occur in this region, what percentage of F 2 offspring is likely to be homozygous for all three genes