A population of butterflies has an allele B for big spots on the wings and b for small spots on the wings. The table below provides data about this population
Genotype BB Bb bb
Number of butterflies 300 400 300
Genotype frequency 0.3 0.4 0.3
Regarding these data about the butterfly population, which of the following statements is correct?
A) The population is in Hardy-Weinberg equilibrium because the number of B alleles is equal to the number of b alleles.
B) The population is in Hardy-Weinberg equilibrium because half of the heterozygotes are B and half are b.
C) The population is not in Hardy-Weinberg equilibrium because p2 and 2pq are different.
D) The population is not in Hardy-Weinberg equilibrium because the genotype frequency of bb is greater than it would be in equilibrium.
Answer: D
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