Which of the following is not assumed in Hardy-Weinberg Equilibrium?

Question

BlackTom AI · Accepted Answer

Hardy-Weinberg equilibrium assumes a set of idealized conditions that prevent allele frequencies from changing between generations, so allele and genotype frequencies remain constant.

1) Relevant knowledge points and concepts
- Hardy-Weinberg equilibrium conditions: random mating, infinitely large (or effectively infinite) population to eliminate genetic drift, no mutation, no migration/gene flow, and no natural selection. These conditions ensure allele frequencies are stable (p and q constant) and genotype frequencies follow p^2 + 2pq + q^2.
- The Baldwin Effect: an independent evolutionary concept suggesting that learned behaviors can influence the course of evolution over time; it is not an assumption used to derive H-W equilibrium.

2) Step-by-step reasoning
- List each answer option and check whether it is one of the H-W assumptions:
  a. Random mating — Yes, required.
  b. The Baldwin Effect — Not part of H-W; unrelated concept.
  c. Infinitely large population — Yes, H-W assumes an infinite population to avoid drift.
  d. No gene flow — Yes, no migration is required.
  e. No selection pressure — Yes, no selection is required.
  f. No mutation — Yes, mutation must be absent for equilibrium.

3) Calculations
- No numerical calculations are required; the argument is conceptual. If allele frequencies are p and q, the H-W expected genotype frequencies are p^2, 2pq, q^2 when all assumptions hold.

4) Why the correct answer is correct
- The Baldwin Effect is a theory about how learned behavior can affect evolution; it does not appear among the assumptions that guarantee Hardy-Weinberg equilibrium. H-W assumptions are explicit constraints on population processes (mating, mutation, migration, selection, drift), not hypotheses about learning and evolutionary feedback.

5) Why other options are incorrect (brief)
- a, c, d, e, f are all explicitly listed assumptions of Hardy-Weinberg: random mating; infinitely large population (no drift); no gene flow; no selection; and no mutation. Each of those, if violated, can change allele frequencies.

6) Conclusion
- Therefore the statement that is NOT assumed in Hardy-Weinberg equilibrium is b. The Baldwin Effect. This matches the provided answer.

Which of the following is not assumed in Hardy-Weinberg Equilibrium?多项选择题

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