When Mendel crossed true-breeding plants bearing yellow seeds with true-breeding plants bearing green seeds, what was the phenotypic ratio among the offspring?

Question

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Mendel's experiments with pea plants showed that when he crossed true-breeding yellow-seeded plants (YY) with true-breeding green-seeded plants (yy), all the offspring (F1 generation) were heterozygous (Yy) and displayed the dominant yellow seed phenotype.

When Mendel Crossed True-Breeding Plants Bearing Yellow Seeds with True-Breeding