In the garden pea population, the emergence of plants producing yellow and green beans is observed. The yellow color is dominant.

In the garden pea population, the emergence of plants producing yellow and green beans is observed. The yellow color is dominant. The share of plants producing green beans is 81%. What is the frequency of homo- and heterozygous plants in this population?

1) Determine the frequency of occurrence of the recessive allele. From the condition of the problem it follows that gg2 = 0.81, then:
2) Determine the frequency of occurrence of the dominant allele:
p = 1 – g = 1 – 0.9 = 0.1
3) Determine the genotypic structure of the pea plant population:
(0.1 + 0.9) 2 = 0.01 AA + 0.18 Aa + 0.81 aa
Answer: 1% aa: 18% aa: 81% aa