18.4 Effects of different forms of selection on evolution

Question 1

What are the three types of selection

Answer 1

1. Stabilising selection
2. Directional selection
3. Disruptive selection

Question 2

What is stabilising selection

Answer 2

Preservation of the average phenotype by favouring average individuals - selection against extreme phenotypes

Question 3

What is directional selection

Answer 3

Changes the phenotype of a population by favouring phenotypes that vary in one direction from the mean of the population - selection for one extreme phenotype

Question 4

What is disruptive selection

Answer 4

Favours individuals with extreme phenotypes rather than those with phenotypes around the mean of the population