1. HARDY-WEINBERG and GENETIC EQUILIBRIUM
CH PP

2. The Gene Pool
Population – group of the same species living in the same area.

3. The Gene Pool
In a population, organisms tend to show small variations of a trait
EX: __________________

4. The Gene Pool
In a population, organisms tend to show small variations of a trait
EX: __________________
Gene Pool- total genetic information stored in a population

5. The Gene Pool
In a population, organisms tend to show small variations of a trait
EX: __________________
Gene Pool- total genetic information stored in a population
Allele frequency- Each allele exists at a certain frequency

6. Variation of Traits in a Population
Histogram- graph showing frequencies of each trait. Usually displays a bell curve.

7. Variation of Traits in a Population
Histogram- graph showing frequencies of each trait. Usually displays a bell curve.
Bell Curve – shows that most members of a population have a similar 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

8. WHAT CAUSES THESE VARIATIONS?
Mutations- Random change in DNA passed to offspring

9. WHAT CAUSES THESE VARIATIONS?
Mutations- Random change in DNA passed to offspring
Recombination- reshuffling of genes during Meiosis
Independent assortment
crossing over

10. VARIATION OF TRAITS IN A POPULATION
Mutations- Random change in DNA passed to offspring
Recombination- reshuffling of genes during Meiosis
Independent assortment
crossing over
Random pairing of gametes

11. 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