Study Guide 3 Question 9

Question 1

Describe in words the relationship shown in the graph below, label each pair as illustrating directional selection, stabilizing selection, or disruptive selection

Answer 1

-Diversifying or disruptive selection

-illustrates that both extreme phenotypes have greater fitness than the average.

-this results in a bimodal distribution, where two distinct groups emerge, causing the extreme phenotypes to become more common than the average.

Question 2

Describe in words the relationship shown in the graph below, label each pair as illustrating directional selection, stabilizing selection, or disruptive selection

Answer 2

-Directional selection

-The left graph shows one extreme phenotype has the highest fitness

-This leads to a population shift towards the beneficial phenotype in the right graph

-Could also occur in the opposite direction

Question 3

Describe in words the relationship shown in the graph below, label each pair as illustrating directional selection, stabilizing selection, or disruptive selection

Answer 3

-Stabilizing selection

-The left graph indicates that the average phenotype has higher fitness than either extreme

-Leading to a population that centers around the mean and reduces phenotypic variation, as shown in the right graph