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Differences in Evolution . Remember evolution means change over time…. Natural Selection . Artificial Selection . Artificial is selective breeding by humans Humans decides who/what lives or dies based traits they find more desirable
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Remember evolution means change over time… Natural Selection Artificial Selection Artificial is selective breeding by humans Humans decides who/what lives or dies based traits they find more desirable They hope its offspring will produce the same traits as well. • Natural is something made by nature • Nature decides the organisms with the best traits to survive and reproduces
Homologous Structures • Homologous structures: structures with different appearances and functions that all derived from the same body part in a common ancestor • The bones in the forelimb of mammals are homologous structures • Different functions, same ancestor structure
Human hand Mole foot Bat wing Fly wing Homologous structures are different than Analogous Structures • Analogous structures have a similar function. • Analogous structures are not evidence of a common ancestor.
Vestigial structures of a whale Vestigial structures • have no apparent function, but resemble structures their ancestors possessed