When two yellow-grain pea plants were crossed, 45 yellow-grain and 14 green-grain plants were obtained.

When two yellow-grain pea plants were crossed, 45 yellow-grain and 14 green-grain plants were obtained. What are the genotypes of the original plants.

In this problem, inheritance occurs according to the type of complete dominance: the gene for yellow grains is dominant (A), the gene for green grains is recessive (a).
The ratio of individuals in the offspring is approximately 3: 1, that is, only 25% of the offspring are homozygous for a recessive trait. This ratio is observed when crossing two heterozygotes.
P: Aa x Aa – two heterozygous parent individuals;
G: A, a x A, a – possible gametes;
F: AA – 25% yellow grain;
Aa – 50% yellow grain;
aa – 25% green-grain.