Peter and Rosemary Grant observed a small group of the large ground finch that colonized Daphne Major in the Galápagos Islands. Within a few years, the descendants of the colonists had evolved beaks that were much larger than those in the original source population. What factors did the Grants think influenced this evolution?

+1 vote

 

The original small size of the colonist pool probably resulted in divergence due to founder effects and genetic drift.

Natural selection occurred due to the larger seeds found on Daphne Major compared to the ancestral island.

Reinforcement occurred due to postzygotic isolation on secondary contact.

The original small size of the colonist pool probably resulted in divergence due to founder effects and genetic drift, and natural selection occurred due to larger seeds found on Daphne Major.

 

asked Dec 28, 2012 in Biology by anonymous
    

1 Answer

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The original small size of the colonist pool probably resulted in divergence due to founder effects and genetic drift, and natural selection occurred due to larger seeds found on Daphne Major.

 

answered Dec 28, 2012 by anonymous

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