A diploid plant has a nuclear gene

A diploid plant has a nuclear gene, named Yellow (Y) required for photosynthesis. When the Y gene is mutated, the mutants cannot photosynthesis and are yellow. The WT allele Y is dominant to the mutant allele (y). what are the phenotype and genotypes of the WT, heterozygous and mutant plants? If you selfed the heterozygous plant, and germinated 120 seeds, what kind of plants do you see and in what proportion?

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