[Campbell Biology P.569] According to Figure 24.17 and the accompanying text, which statemen... | Practice Question
According to Figure 24.17 and the accompanying text, which statement accurately distinguishes between the punctuated model and the gradual model of speciation?
A: The punctuated model suggests that species diverge slowly and steadily over long periods, while the gradual model shows rapid change followed by long periods of stasis.
B: In the punctuated model, most morphological changes occur quickly when a new species branches off, followed by little change, whereas the gradual model depicts continuous, slow divergence.
C: Both models propose that speciation occurs suddenly with no intermediate forms in the fossil record.
D: The gradual model is supported by fossil evidence showing species persisting unchanged for millions of years, while the punctuated model emphasizes continuous morphological evolution.
Explanation
The text states: 'The term punctuated equilibria is used to describe these periods of apparent stasis punctuated by sudden change Figure 24.17a . Other species do not show a punctuated pattern; instead, they appear to have changed more gradually over long periods of time Figure 24.17b .' This directly describes rapid change followed by stasis for punctuated, and continuous slow change for gradual.