In a particular plant, green seed color is dominant to yellow seed color. If all of the offspring of a cross were heterozygous green, what were the genotypes of the parents?

Let's suppose that the allele for yellow seed is Y and that for green seeds is y. Hence the genotype of the heterozygous yellow seeded plant will be "Yy" and that for green seeded plant will be "yy" (as the recessive allele is expressed only in homozygous conditions)

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