In a stable population where the dominant phenotype appears in 75% of individuals, what is the frequency of the dominant allele in that population?

Explanation

Given that 75% of the population exhibits the dominant phenotype, the frequency of the dominant allele (p) can be calculated using the Hardy-Weinberg principle. Since the dominant phenotype includes both homozygous dominant (p²) and heterozygous (2pq) individuals, q² = 1 - 0.75 = 0.25, so q = 0.5. Therefore, p = 1 - q = 0.5 or 50%.