This scenario is an example of directional selection. Directional selection occurs when individuals at one extreme of a trait's variation (in this case, height) are favored, leading to a shift in the population's average trait value over generations. In this case, as giraffes that are taller are better able to reach food in higher trees, their height is increasing over generations in response to environmental pressures.
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 Stabilizing Selection Stabilizing Selection Disruptive Selection Disruptive Selection Directional Selection and Disruptive Selection Directional Selection and Disruptive Selection Directional Selection
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