He is also heterozygous for deafness. What is his genotype for hearing?

Putting the two together, we find that the male has an overall genotype for these two traits of WWDd.

The female is heterozygous for both traits with one dominant and one recessive allele on each homolog. The image on the left below shows the female's chromosomes before crossing over. After crossing over occurs, her chromosomes look like the image on the right.

What gametes will she produce now?

Now, perform a punnett square to determine what offspring will result.

Your punnett square should look similar to the one below. If it does not, review the material on gamete formation and how to set up the punnett square and try again.

Now, count up how many of the offspring have each genotype and phenotype .

Return to the question page and select the correct answers.