Question

In pea plants, yellow peas are dominant over green peas. Predict the genotypic and phenotypic outcome of a cross between a plant heterozygous for yellow peas and a plant homozygous for green peas.

Answer 1

The cross between a heterozygous yellow pea plant (Yy) and a homozygous green pea plant (yy) can be represented as follows:

Yy (yellow pea heterozygous) x yy (green pea homozygous)

The offspring will have a genotype of Yy, which means they will be heterozygous for the pea color trait.

The phenotypic outcome of this cross will be 100% yellow peas, since the yellow allele (Y) is dominant over the green allele (y). The heterozygous plants will express the dominant yellow phenotype, even though they carry both yellow and green alleles.

So the genotypic ratio will be 1 Yy (yellow) : 0 yy (green), and the phenotypic ratio will be 100% yellow : 0% green.



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