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Which statement best describes the Hardy-Weinberg principle?

Correct answer: D. When there is a large population, the mechanism of inheritance does not change allele frequencies.

  • A. Recessive alleles eventually disappear in large populations.
  • B. Expected frequencies of alleles are impossible to predict mathematically.
  • C. Dominant alleles become more prevalent in large populations.
  • D. When there is a large population, the mechanism of inheritance does not change allele frequencies.

Explanation

The Hardy-Weinberg principle serves as a model for understanding how allele frequencies remain constant over generations in the absence of evolutionary forces. The correct option, D, highlights that in a large population where the five conditions of the Hardy-Weinberg principle are met-namely, large population size, random mating, no mutation, no gene flow, and no genetic drift-the mechanism of inheritance does not alter allele frequencies. Option A is incorrect because recessive alleles do not disappear; they remain in constant frequency if no evolutionary pressures are present. Option B is incorrect because the principle provides a mathematical framework to predict allele frequencies. Option C is incorrect because dominant alleles do not inherently become more prevalent solely due to population size.

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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.

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