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What must be true about a population when it is at an equilibrium allele frequency? 


What must be true about a population when it is at an equilibrium allele frequency? 


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Answer #1

The conditions for Hardy-Weinberg equilibrium:

  1. Population is infinitely large -– or large enough to minimize the effect of genetic drift, which is change in allele frequencies due entirely to random chance (and not selection).
  2. No selection occurs - so all the individuals in the population have an equal chance of surviving and reproducing.
  3. Mating is random – so that an individual is equally likely to mate with any potential mate in the population, regardless of genotype or phenotype.
  4. No migration - so no alleles enter or leave the population.
  5. No mutation - so allelic characteristics do not change
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