Evolution of Galapagos Finches
Question 1
A change in the weather pattern that affected the flowering season of Tribulus cistoides.
The introduction of a new food source in the form of Tribulus terrestris seeds on the neighboring island.
An increase in predators on the original island of Santa Cruz, forcing finches to migrate.
The eruption and subsequent land bridge allowed for gene flow between previously isolated islands.
Question 2
Geographic isolation since the finches are now separated by water.
Behavioral isolation due to differences in feeding behavior.
Gametic isolation due to incompatibility of gametes from the two populations.
Temporal isolation due to different flowering seasons of their respective food plants.
Question 3
Directional selection favoring specialization in beak size.
Disruptive selection favoring either the ancestral or larger beak size.
Stabilizing selection favoring intermediate beak sizes.
Sexual selection based on beak size attractiveness.
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