17.2

Question 1

Natural Selection

Answer 1

Natural selection on single gene traits can lead to change in allele frequencies, and, thus to change the phenotype frequencies.

ex: Initial pop is 80% brown but after many generations it becomes 50% black because black is a color better suited to the environment.

Question 2

Directional Selection

Answer 2

The mean changes because individuals with a certain trait are more successful at surviving and reproducing than others

Question 3

Stabilizing Selection

Answer 3

When individuals near the center have higher fitness than individuals at either end. Center stays in the center but it gets narrower because it’s more common.

Question 4

Disruptive Selection

Answer 4

When individuals at the outer ends of the curve have higher fitness than individuals near the middle. Thus they start to split apart and form new species due to their traits.

Question 5

natural selection

Answer 5

1. nonrandom mating, small population size, immigration or immigration, mutations, and natural selection.

Question 6

Genetic Equilibrium

Answer 6

When a population is not, that means allele frequencies don’t change so the population is in genetic equilibrium