Genetic Variation within Populations

1. Genetic Variation within Populations

2. Phenotypes and Genetic Variation • Body size and feather patterns in penguins are examples of phenotypes. • Phenotype: trait produced by one or more genes.

3. Phenotypes and Genetic Variation • Natural selection acts on different phenotypes in a population. • Lots of genetic variation= lots of phenotypes • Greater # phenotypes more likely to survive changing environments.

4. Phenotypes and Genetic Variation • Genetic variation is stored in a population’s gene pool. • the combined alleles of all individuals in a population • Different versions of genes (alleles) can be formed when organisms mate and have offspring

5. Phenotypes and Genetic Variation • Allele Frequency: how common a version of a gene (allele) is in a population. GG GG gg GG Gg gg Gg

6. Phenotypes and Genetic Variation • If brown skin color became advantageous, what would likely happen to the frequencies of alleles G and g in the gene pool? GG GG gg GG Gg gg Gg