Question

While all giraffes are tall they are not all the exact same height. Within a population, the height of each individual giraffe can vary. Scientists observe that over many generations the average height of the giraffe population is increasing. They believe this in response to trees producing fewer leaves on lower branches, meaning the giraffes' main food source is higher up.

What kind of selection is this an example of?

(1 point)
Responses

Directional Selection
Directional Selection

Directional Selection and Disruptive Selection
Directional Selection and Disruptive Selection

Disruptive Selection
Disruptive Selection

Stabilizing Selection

Answer 1

This example is an illustration of **Directional Selection**. In this case, the average height of the giraffe population is increasing over generations in response to environmental changes (fewer leaves on lower branches), favoring taller individuals that can reach food higher up. Therefore, the correct response is:

**Directional Selection**