AP BIOLOGY

Detailed explanation-1: -In a finch population, if finches having large beaks and finches having small beaks increase in numbers while finches with average beaks decreases is directional selection.

Detailed explanation-2: -Why do you think the average beak depth of the birds increased? Because the drought reduced the number of seeds and finches with bigger beaks were able to eat the larger and harder seeds so more of them survived.

Detailed explanation-3: -Directional selection: One of the extreme phenotypes has the highest fitness. The bell curve shifts towards the more fit phenotype. Disruptive selection: Both extreme phenotypes have a higher fitness than intermediate phenotypes. The bell curve develops two peaks.

Detailed explanation-4: -On the graph of Battle of the Beaks, we noticed that the finches with a larger beak had a better advantage over small beak finches because they were able to adapt when the environment changed and collected more food.