Bio Cards Ch23.txt

• * Evolution�s Smallest Scale
• * Change in Allele Frequency in a Population over Generations

• * Natural Selection
• * Genetic Drift- Chance Events
• * Gene Flow

-Transfer of Alleles Between Populations

• -The Avg Heterozygosity
• -The Avg Percent of loci that are Heterozygous

-Gradient Change in a Character Along a Geographic Axis

• * Ultimate Source for New Allele
• * A Change in the Nucleotide Sequence of an Organisms DNA

-More Likely to Occur in Cell Lines That Produce Gametes, Allowing them to be Passed On

-Most Are Lost When The Individual Dies

Harmful

Rarely

-Principle Frequency of alleles and genotypes in a population will remain constant from generation to generation provided that Mundelein segregation and recombination of alleles are at work.

• * No Mutation
• * Random Mating
• * No Natural Selection
• * Extremely Large Population
• * No Gene Flow

When a few individuals become isolated from a large population, this smaller group may establish a new population whose gene pool differs from the source population.

Sudden Change in Environment Drastically Reduces Size of Population

Gene Flow, Mutation

Adaptive Advantage

The Contribution an Individual Makes to The Gene Pool of the Next Generation Relative to The Contribution of Other Individuals

Phenotype Extremes

Intermediate Phenotypes.