In tomatoes, two alleles of onegene determines whether the plant has purple (P) or green (G) stems, and a separate, independent gene determines whether the leaves a "cut" (C) or "potato" (Po). Five crosses of tomato plants (with the phenotypes show) give the following results:

Number of Progeny
Parental
Mating Phenotypes P, C P, Po G, C G, Po
1 P, C x G, C 321 101 310 107
2 P, C x P, Po 219 207 64 71
3 P, C x G, C 722 231 0 0
4 P, C x G, Po 404 0 87 0
5 P, Po x G, C 70 91 86 77

a. Determine which alleles are dominant.
What are the most probable genotypes for the paren'ts in each cross?