Yellow seeds are dominant to green seeds in peas. Show a cross between a homozygous yellow seed with a green seed. Identify the genotypes and phenotypic ratio.

Since yellow seeds are dominant, let us assign them the alleles YY

The green seeds will be represented by yy alleles

Therefore for a seed to be green it will have homozygous yy allele however heterozygous Yy seed will be phenotypically yellow

A cross between a homozygous yellow and green will be

 (YY × yy)

The resulting offsprings or the F1 generation

will have the genotype. Yy, Yy, Yy, Yy

Phenotypically, all the offsprings will be yellow