HARDY-WEINBERG and GENETIC EQUILIBRIUM

1
HARDY-WEINBERG and GENETIC EQUILIBRIUM

• Ch. 16-1 pp 317-320

2
The Gene Pool

• Population group of the same species living in
  the same area.
• Gene Pool- genetic variation stored in population
• Gene frequency- each allele exists at a certain
  frequency

3
Variation of Traits in a Population

• In a population, organisms tend to show small
  variations of a trait
• Bell Curve
• shows that most members of a population have the
  same variation of a trait.
• Only a few individuals display extreme variations
  of the trait.

4

• EX A few fish are
• very short and a few are
• very long, most are of
• average length.
• Variations are caused by mutations, genetic
  recombination, and random-pairing of alleles

5
Hardy-Weinberg Genetic Equilibrium

• Hardy-Weinberg equilibrium describes populations
  that are not evolving
• Genotype frequencies stay the same over time as
  long as certain conditions are met
• Very large populations
• No emigration or immigration
• No mutations
• Random mating
• No natural selection