In Mendel's pea plants, the gene for purple or white flowers (alleles A and a) is on chromosome 1, and the gene for round or wrinkled seeds (alleles R and r) is on chromosome 7. The following dihybrid cross is made: AA ; RR x aa ; rr. What proportion of the gametes produced by an F1 plant are expected to be AR gametes (i.e. have the A and R alleles)? For the F1, an AR gamete is an example of a _ gamete. What proportion of the F2 progeny are expected to have an Aa ; rr genotype? (show your work) Since purple flowers are dominant to white and round seeds are dominant to wrinkled, what proportion of the F2 progeny are expected to be wrinkled seeds and produce purple flowers? (show your work) Chromosome 1 and Chromosome 7 are an example of _.