Multiple Choice Questions

The percentage of different alleles that exist in a population for a given gene. Allele frequencies don't always match up with phenotype frequencies, as the phenotypes of recessive alleles won't be expressed in heterozygous individuals.
  • Bottleneck effect on population size
  • Genetic drift
  • Allele frequencies
  • Bottleneck effect
Greater impact upon a smaller population, rather than a large population. When a large populations mating patterns remain random, the allele frequency remains constant. But when a population is small or becoming smaller, allele frequencies will change between generations by chance so begin to drift into an increase or decrease
  • Bottleneck effect on population size
  • Genetic drift
  • Allele frequencies
  • Genetic drift impact on different sized populations
The changes in allele frequency will be greater in smaller populations, because an individual's alleles represent a greater percentage of the alleles of the population.
  • Bottleneck effect
  • Allele frequencies
  • Bottleneck effect on population size
  • Migration effects on population
When a small population (a small group of individuals) colonises a new isolated area, such as an island and the range and the frequency of alleles that are present within this small group is unlikely to be representative of the original population that the founder population came from.
  • Founder effect
  • Genetic drift
  • Bottleneck effect
  • Gene flow
Occurs when a population suddenly reduces in size due to an extreme event (human or enviromental) that doesn't pick favourable alleles
  • Founder effect
  • Gene flow
  • Bottleneck effect
  • Genetic drift
When there is a rapid decline in the population size, it is likely that the range of alleles will be reduced and the frequency of alleles will change. If the population increases again it will have reduced genetic biodiversity.
  • Allele frequencies
  • Migration effects on population
  • Bottleneck effect
  • Bottleneck effect on population size
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Multiple Choice Questions
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