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average value of a trait is shifted in a particular direction (higher or lower)
acts to standardize the population around some average value. May be the most common type of selection
the environment selects for the two extremes, against the average, splitting the population in two or more types
replacement of a light morph by a dark morph in an industrialized area - nearly 200 species of Lepidoptera
The adjustment or changes in behavior, physiology, and structure of an organism to become more suited to an environment
Structures derived from a common ancestor or same evolutionary or developmental origin, evidence of divergent evolution
Structures of different species having similar or corresponding function but not from the same evolutionary origin. Evidence of convergent evolution. Superficially similar, but structurally and developmentally different
when an interbreeding population or species splits into two or more descendant species, resulting in differences
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