A heterozygous plant with round peas (Rr) is allowed to self-fertilize, so that the probability of offspring having round peas is ¾ and wrinkled peas is ¼. Assuming pea pods with five peas are produced and that there are two possible phenotypes and that p = round and q = wrinkled, what equation would you use to calculate the expected frequency of obtaining four wrinkled and one round pea in a five-seeded pod?
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