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Understanding Natural Selection and Population Distribution

Polygenic traits exhibit a normal distribution with phenotype ranges around an average value. Different types of natural selection, like directional, stabilizing, and disruptive, shape populations based on environmental pressures. Examples include giraffe neck length, rabbit leg length, and clam size influencing predator-prey dynamics.

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Understanding Natural Selection and Population Distribution

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  1. Natural Selection and Population Distribution

  2. 1. Polygenic Traits- phenotype ranges around an average value. NORMAL DISTRIBUTION

  3. 2. Types of Natural Selection- when the environment favors particular traits Short Long Giraffe Neck Length a. Directional Selection: evolution favors an extreme trait.

  4. b.Stabilizing Selection: extremes are selected against, favors the average Short legs- too slow Long legs- can not turn sharply shorter longer Rabbit Leg Length

  5. c. DISRUPTIVE SELECTION- Selection that favors the extremes of a population trait. Predators find it harder to locate smaller clams and are unable to pry open larger clams. Predators favor clams of a medium size. smaller larger Size of Clams

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