Genetic Variation within Populations 11.1 Evolution Genetic Variation within Populations 11.1

Heritable variation. To the extent that the variation in color and banding patterns in this snail population is heritable, it can be acted on by natural selection.

Two Main Sources Genetic Variation Why it’s beneficial: Results in Phenotype variation which increases the likelihood that some individuals can survive a change in the environment. How it’s stored in a population: As alleles in a gene pool. How it’s measured: With allele frequencies; how common each allele is in the population. Two Main Sources Mutation: A change in a DNA sequence which can form a new allele. Recombination: New allele combinations can form during meiosis, when each parent’s alleles are arranged in new ways in the production of gametes.

Microevolution: Observable change in allele frequencies of a population over time.