HARDY-WEINBERG and GENETIC EQUILIBRIUM Ch. 16-1 pp 317-320

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

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.

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

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