Evolution of Populations

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Presentation transcript:

Evolution of Populations Chapter 17.1 & 17.2 (p.482-493)

Natural selection effects genotypes by acting on phenotypes.

How might the frequency of alleles within this mouse population change if… Mice that are homozygous dominant migrated into the area. A disease kills almost all homozygous recessive mice. A flood carries many heterozygous and homozygous recessive mice several miles away to a new area. How might this new population’s allele frequency differ from the original population? The flood covers the black volcanic rock in light-colored sand. Female mice begin to prefer males with dark coats over light coats.

Genetic drift can alter allele frequencies by chance.

Natural selection acting on single-gene traits:

Natural selection acting on polygenic traits:

The Hardy-Weinberg principal can help us understand if a population is evolving. No mutations Very large population size No gene flow Random mating No natural selection