Geological Evidence Reveals That the Barrier Islands Where the Populations

Question 33

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Geological evidence reveals that the barrier islands where the populations of oldfield mice shown in the figure above occur formed only 6000 years ago.Presumably,divergence in coat color occurred after the islands' formation (Hoekstra et al.2006).Explain how these dramatic variations in coat color between populations could have evolved over such a short period relative to the scale of evolutionary time. Geological evidence reveals that the barrier islands where the populations of oldfield mice shown in the figure above occur formed only 6000 years ago.Presumably,divergence in coat color occurred after the islands' formation (Hoekstra et al.2006).Explain how these dramatic variations in coat color between populations could have evolved over such a short period relative to the scale of evolutionary time.

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