1 Blackish Tan 6. 1 Blackish Tan 7. The yellow parent was an offspring from cross 1. The yellow parent was an offspring from cross 2. Determine the gene action controlling coat color in mice.
Rats can be either albino or colored, a trait that is controlled by a single gene.
For an animal to express one of these colors, they must have a dominant allele at the gene controlling the presence of coat color. Rats recessive at this gene are albino. Four different albino rats were crossed to a pure breeding gray rat. All of the F1 rats from each mating were gray. Then matings of male and female F1 rats within each original cross were made.