In the analysis cross, a yellow-seeded pea plant was crossed with a recessive green-seeded homozygote.

In the analysis cross, a yellow-seeded pea plant was crossed with a recessive green-seeded homozygote. As a result, 50% of the offspring had yellow seeds and the other 50% had green seeds. What genotype did the studied pea plant have? Explain the answer with the crossing scheme.

The yellow color of pea seeds is a dominant trait (A), and green is a recessive trait (a). Therefore, the yellow trait of seeds in peas can be in two variants in the genotype – homo- (AA) and heterozygous (Aa).

This crossing is analyzing – one of the organisms has a homozygous recessive trait – green – aa. The result of crossing is in a 1: 1 ratio and each offspring receives one gene from each parent. Therefore, the studied plant has a heterozygous genotype – Aa.

P: Aa x aa
a A Aa a aa