In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.This would lead to ____ in the ancestral giraffe population.
A)disruptive selection
B)directional selection
C)sexual selection
D)genetic drift

Question

Quizplus · Accepted Answer

Directional selection favors individuals with extreme phenotypes, leading to a shift in the mean of the population. In this case, longer necks allowed animals to reach higher tree branches, providing a fitness advantage and leading to directional selection for longer necks in the ancestral giraffe population.

In Early Ancestors of the Modern Giraffe, Longer Necks Allowed