Mapping Chromosomes Problem 1


Individuals from a strain of homozygous recessive frizzy-haired mice (frfr ShSh) are mated to individuals from a strain of homozygous recessive shakers (FrFr shsh). The first generation offspring were then mated to frizzy-haired shakers, and the testcross progeny were

1. What phase of linkage is this?

2. How far apart are these two genes?

3. If the first generation offspring were intercrossed, what would be the expected phenotypes and their ratios in the second generation?


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