1. HARDY-WEINBERG and GENETIC EQUILIBRIUM
Ch pp

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