You Are Studying the Inheritance of the Recessive Red-Spotted (R)

Essay

You are studying the inheritance of the recessive red-spotted (r) trait in pea plants. You identify a phenotypically wild-type plant that, when crossed to a red-spotted plant, produces 5/6 wild-type offspring and 1/6 red-spotted offspring. When you look at the chromosomes of the wild-type plant, you note that it contains an extra copy of chromosome 2, which is where the red-spotted locus is located.
a. What is the genotype of the wild-type plant? What gametes will this plant generate? What are the genotypes of the wild-type and red-spotted offspring?
b. You identify a plant that you think is genotypically Rrr. If you cross this plant to an rr individual, what proportion of wild-type and red-spotted offspring would you expect?