Evolution: Types Of Natural Selection

Question 1

Stabilizing selection

Answer 1

• middle forms of a trait are favored
• alleles that express extreme forms are eliminated from a given population
• middle Phenotype is favored rather than extremes

EX. PEACOCKS

Question 2

Directional selection

Answer 2

• One extreme Phenotype is favored
• the middle or stable Phenotype could be eliminated
• one animal type is favored than over time the other animal type becomes favored

EX. PEPPER MOTHS

Question 3

Disruptive selection

Answer 3

• Both extremes are favored
• middle forms are eliminated
• rare in comparison to other selections

EX. ROCK POCKET MICE