Modes of Natural Selection

Question 1

directional selection

Answer 1

polygenic traits follow a bell-shaped curve with most individuals clustered around average. If natural selection removes those at one extreme, population average over time will move in the other direction

Question 2

Divergent Selection

Answer 2

removes members near average. Overtime divergent selection will split population in two leading to new species

Question 3

Stabilizing selection

Answer 3

both extremes of a trait are selected against driving population closer to average

Question 4

artificial selection

Answer 4

humans intervene in mating of many animals and plants to obtain a specific breed with desired traits

Question 5

sexual selection

Answer 5

animals don’t choose mates randomly but have rituals and displays that play a role in attracting and choosing mate

Question 6

kin selection

Answer 6

animals that socially live share alleles with other individuals and will sacrifice themselves for sake of allele shared with another individual