Bumper sticker of the day: "Time is the best teacher. Unfortunately, it kills all its students."

Review of Lecture 22: Genes by the bunch: Population genetics.

1. Gene pool: The total of all alleles in the population.

2. Review of genetic terms: homozygous, heterozygous, dominant, recessive, genotype, phenotype.

3. Hardy-Weinberg equilibrium: the proportion of genes in a population tends to stay the same generation after generation.

Several assumptions must be met for this to be true: Large population, random mating, no mutation, no gene flow.

4. Evolution occurs when the equilibrium is upset (natural selection, mutation pressure, gene flow, genetic drift).

5. Speciation and species concepts: morphological and biological. For speciation to occur, populations must be isolated. Isolating factors include physical, biological and behavioral.

6. Polyploidy.

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Last updated May 23, 1997.