Two plants differ in the seed color they produce. One plant produces green seeds, the other produces yellow seeds. Yellow is the dominant phenotype. If the parental plants are true-breeding, what would the resulting F1 offspring's genotype be?

Genotype: 100% or 4/4 of the progeny will be heterozygous for the trait, Yy.

Explanation:

Available data:

Let us say that the allele Y expresses yellow color and is dominant over the allele y which expresses the green color and in the recessive one.

Cross: a green-seeded plant with a yellow-seeded plant

Parental)                 YY             x             yy

Phenotype)   Yellow seeds            Green seeds

Gametes)           Y      Y                        y        y

Punnet square)      Y            Y

                     y       Yy            Yy

                     y        Yy            Yy

F1) Phenotype: 100% of the progeny will be yellow-seeded

  Genotype: 100% or 4/4 of the progeny will be heterozygous for the trait

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