Bumper sticker of the day: "The gene pool could use a little chlorine."

Review of Lecture 21: Onward and upward: Natural Selection

1. Charles Darwin, Charles Lyell, Thomas Malthus, Alfred Wallace: voyage of the HMS Beagle, the Galápagos Islands

-- the idea of natural selection:

a) species have excess reproductive capacity

b) variation among offspring -- not all survive

c) the environment selects which individuals will survive and reproduce

2. Natural Selection: differential reproductive success among individuals in a population.

3. Populations, genetic variability, selection pressure, fitness.

4. Kinds of natural selection: stabilizing, directional, balancing, disruptive.

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Last updated May 21, 1997.