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Transcript
GENETIC EQUILIBRIUM I pp. 321-325 WHAT IS EQUILIBRIUM? No net change in the population Evolution is likely not occurring Hardy-Weinberg Principles To stay in equilibrium: No natural selection No mutations No gene flow Infinitely large population Mating is random WHAT PUSHES A POPULATION OUT OF EQUILIBRIUM? I. Natural selection Organisms best suited to their environment live to reproduce and pass on their genes Acts on a phenotype Varying types of selection directional selection: individuals with a more extreme form of trait have higher fitness stabilizing selection: having average form of trait has highest fitness disruptive selection: individuals with any extreme trait has a higher fitness sexual selection: choose mates based on specific traits and those traits increase in the population
