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Most populations on earth are affected by several factors, such as genetic drift, mutations, and natural selection.
Which statement can be made about a population that experiences changes in gene frequencies?
The Hardy-Weinberg equilibrium is maintained.
Mutations will not affect the population.
Evolution is occurring in the population.
Lethal genes will eventually be expressed.
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Correct answer: Evolution is occurring in the population.
Reason: A change in gene (allele) frequencies from one generation to the next is the definition of evolution (microevolution). The other statements are false: Hardy–Weinberg equilibrium requires allele frequencies to remain constant (so it would not be maintained), mutations can affect the population, and lethal alleles are not guaranteed to be expressed (they may be recessive and remain hidden in heterozygotes).
Reason: A change in gene (allele) frequencies from one generation to the next is the definition of evolution (microevolution). The other statements are false: Hardy–Weinberg equilibrium requires allele frequencies to remain constant (so it would not be maintained), mutations can affect the population, and lethal alleles are not guaranteed to be expressed (they may be recessive and remain hidden in heterozygotes).
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