Evolution Overview Charles Darwin. Proposed the Theory of Evolution Evolution -gradual change in a species through adaptations over time Theory of Evolution= Natural Selection. Natural Selection. Natural selection is based on the following ideas: natural variation
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Mimicry- a structural adaptation that enables one species to resemble another species.
Physiological Adaptation- changes in an organism’s metabolism that occurs quickly. Many bacteria have become resistant to penicillin over the last 50 years
Analogous Structures- Body structures on different organisms that are similar in function but did not evolve from the same ancestor.
Vestigial Structures- Body structure in an organism that no longer serves its original purpose but was useful to the ancestor
Embryo- earliest stage of growth and development of both plant and animals
Genetic Equilibrium- the frequency of alleles remains the same over generations
Reproductive isolation: occurs when organisms no longer breed with each other to produce fertile offspring because of