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Evo quiz 2

Adaptation and sexual selection

QuestionAnswer
Directional selection fitness consistently increases (or decreases) with the value of a trait. Reduces variation (usually not dramatically though).
Stabilizing selection individuals with intermediate values of a trait have the highest fitness. Reduces variation (cuts off the ‘tails’ of a trait’s distribution). Does not alter average value of a trait.
Disruptive selection individuals with extreme values of a trait have the highest fitness. Increases variance, i.e. more even distribution of populations among trait variation scale (trims off the top of a trait’s distribution).Does not alter average value of a trait.
Types of tests? : experiments, observational studies and comparative method
Adaptation a trait or characteristic of an organism in result to natural selection, i.e. one that increases the fitness relative to individuals without the trait
Alternative explanation? 1)Differences among populations are not always adaptive.(mutations that become fixed due to genetic drift. Variation might be selective neutral)
Created by: bfreeman17
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