5. a summer-squash plant that is true-breeding for disc-shaped fruit is crossed with a summer-squash plant that is true-breeding for long fruit. all the f1 progeny have disc-shaped fruit. when the f1 progeny are intercrossed, f2 progeny are produced in the following ratio: 9/16 disc-shaped fruit: 6/16 spherical fruit: 1/16 long fruit. a.(1 pt) use generic gene symbols a and b for the two loci and give the genotype for each parent, the f1 progeny, and each f2 progeny. b.(1 pt) what phenotypic and genotypic ratios would be expected in a backcross between the f1 progeny and the parent with long fruit?