Patterns of Evolution

Sequential EvolutionChanges in the gene pool from one generation to the next. Populations evolve gradually as they become adapted to their environment.

Divergent EvolutionAncestral population splits into two species, resulting in the evolution of different traits in similar species.

ancestor

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Adaptive RadiationRelatively rapid proliferation of species from a common ancestor. Usually in response to a new habitat or release from competition.

Convergent EvolutionThe evolution of similar traits in unrelated species, usually the result of occupying similar habitats or ecological niches.

Parallel Evolution*Two species diverge from a common ancestor, but then evolve in a similar fashion over time.

Evolution occurs in fits and starts, with long periods of little change, punctuated by periods of rapid change.

Slow and steady accumulation of changes results in new species.