Parents                                         
Progeny

         a) round,
yellow x round,
yellow                
9/16 round, yellow

3/16 round, green

3/16 wrinkled, yellow

1/16 wrinkled, green

         b) round,
yellow x round,
yellow                
3/4 round, yellow

1/4 wrinkled, yellow

c) wrinkled, yellow x round, yellow    6/16
wrinkled, yellow

2/16 wrinkled, green

6/16 round, yellow

2/16 round, green

On the basis of these ratios, determine a possible genotype for
each of the parent plants in each set of crosses.