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L4 ch 24 - Lecture 4 Ch-24 Evolution-II Darwinian Fitness...

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Lecture 4: Ch-24 Evolution-II Darwinian Fitness The relative likelihood that a genotype will contribute to the gene pool of the next generation as compared with other genotypes. Is a measure of reproductive success The average reproductive success of members in a population is called the mean fitness of the population. If individuals with a higher fitness increase in numbers, then the population is said to be well-adapted to its environment. Patterns of Natural Selection: Directional, Stabilizing, Disruptive, Balancing, and Sexual Natural selection leads to adaptation so that a species is better able to survive long enough to reproduce. Types of Selection: Directional, Stabilizing, Disruptive, Balancing, and Sexual Directional Stabilizing Disruptive Directional Stabilizing Disruptive Directional-favors extreme phenotypes; changes the average value of a trait by favoring one direction Stabilizing- favors intermediate phenotypes; reduces the amount of variation in a trait by
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