Question: Crossing true-breeding pea plants with yellow peas with true-breeding plants with green peas yielded an F1 generation with 100% offspring plants with yellow peas. The F1 plants are self- fertilized and produce F2. In a randomly selected set of 50 peas from F2 you notice the following phenotypic numbers: 42 yellow and 8 green. Using the Hardy-Weinberg principle, what is the observed frequency of the recessive allele in this F2 population?
O 0.60
O 0.40
O 0.36
O 0.16
O 0.50