Essential Genetics 6th Edition by Daniel Hartl

تمرين 15

Two pure-breeding strains of mice are crossed to produce
mice that are heterozygous for three linked genes with alleles Aa, Bb, and Dd. Numerous triply heterozygous
mice are testcrossed, and the genotypes and numbers of the resulting progeny are as follows:

(a) Which gene is in the middle?
(b) Specify the genotype of the
triple heterozygote as completely as possible, with the genes in the correct order and the correct alleles on each chromosome.
(c) Which two genes are closest together?
(d) What is the map distance between the two closest genes? Assume that interference is complete between these two genes.
(e) If interference is not complete, how will the true map distance differ from the value you calculated in part (d) ? Briefly explain why this is so.