According to the punctuated equilibria model:
a. Given enough time, most existing species will branch gradually into new species.
b. Most new species accumulate their unique features relatively rapidly as they come into existence, then change little for the rest of their duration as a species.
c. Most evolution occurs in sympatric populations.
d. Speciation is usually due to a single mutation.

검증된 단계별 안내

Understand the concept of punctuated equilibria: This model suggests that species experience long periods of stability (equilibria) interrupted by brief periods of rapid change (punctuation).

Identify the key characteristics of punctuated equilibria: Rapid changes occur during speciation events, followed by long periods where species remain relatively unchanged.

Analyze option a: This describes gradualism, where species slowly evolve over time, which contrasts with the punctuated equilibria model.

Evaluate option b: This aligns with the punctuated equilibria model, as it describes rapid changes followed by stability.

Consider options c and d: Sympatric evolution and single mutations are not central to the punctuated equilibria model, which focuses on rapid changes during speciation events.

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주요 개념

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Punctuated Equilibria Model

The punctuated equilibria model, proposed by paleontologists Niles Eldredge and Stephen Jay Gould, suggests that species experience long periods of stasis, where little evolutionary change occurs, punctuated by brief, rapid events of speciation. This contrasts with the gradualism model, where species evolve continuously over time. Understanding this model is crucial for interpreting patterns of evolutionary change in the fossil record.

Speciation

Speciation is the process by which new species arise from existing ones. It can occur through various mechanisms, such as allopatric, sympatric, or parapatric speciation, often involving genetic divergence and reproductive isolation. In the context of punctuated equilibria, speciation is seen as a rapid event that contributes to the distinct features of new species, followed by periods of little change.

Sympatric Populations

Sympatric populations refer to groups of organisms that live in the same geographic area and have the potential to interbreed. Sympatric speciation occurs when new species evolve from a single ancestral species while inhabiting the same region, often through mechanisms like polyploidy or disruptive selection. This concept is important for understanding how speciation can occur without geographic isolation, as mentioned in the question.