In a very large population, a quantitative trait has the following distribution pattern:
Figure 23.1
-If the curve shifts to the left or to the right, there is no gene flow, and the population size consequently increases over successive generations, then which of these is (are)probably occurring?
1) immigration or emigration
2) directional selection
3) adaptation
4) genetic drift
5) disruptive selection

Question

In a very large population, a quantitative trait has the following distribution pattern:
  Figure 23.1
-If the curve shifts to the left or to the right, there is no gene flow, and the population size consequently increases over successive generations, then which of these is (are)probably occurring?
1) immigration or emigration
2) directional selection
3) adaptation
4) genetic drift
5) disruptive selection

Quizplus · Accepted Answer

Directional selection (2) can cause a shift in the curve to the left or right, and adaptation (3) is a result of this process, leading to increased population size over generations.

In a Very Large Population, a Quantitative Trait Has the Following