Question

In pea plants, yellow seeds (y) are dominant to green seeds (y) and round seeds (r) are dominant to wrinkled seeds (r). the genes for seed color and seed shape are on different chromosomes. two true-breeding parents, one with yellow round peas and the other with green wrinkled peas, are crossed. what are the genotypes of the parents, and what kind of gametes will they produce?

Answer 1

This can be most efficiently answered using a Punnett square for crossing between YYRR and yyrr (true breeding parents, so homozygous)

yyrr
YYRR YyRr
So the only possible genotype of offsprings is YyRr, and the phenotype are yellow and round.

Answer 2

Let the yellow dominant seeds be represented by Y

Let the green seeds be represented by y

Let the round seeds be represented by R

Let the wrinkled seeds be represented by r

The genotype will be YyRr.

The phenotype are yellow round seeds .

They will produce YR, Yr, yR, and yr gametes equally.