Final answer:
In a population of 100 individuals with a dominant allele frequency of 0.7, there would be 9 individuals with the recessive phenotype.
Step-by-step explanation:
The question states that the allele frequency of the dominant allele is 0.7 in a population of 100 individuals. To find the number of individuals with the recessive phenotype, we first need to calculate the frequency of the recessive allele. Since the dominant allele frequency is 0.7, the recessive allele frequency can be found by subtracting it from 1: 1 - 0.7 = 0.3.
The recessive phenotype is expressed in individuals who are homozygous for the recessive allele (aa). The frequency of homozygous recessive individuals can be calculated using the Hardy-Weinberg equation q² = 0.3² = 0.09. To find the number of individuals with the recessive phenotype, we multiply this frequency by the total population size: 0.09 x 100 = 9 individuals.