unit 9 notes 4 and 5

Question 1

What are the 3 types of natural selection?

Answer 1

Stabilizing, Directional, Disrupitive

Question 2

Define stabilizing selection

Answer 2

Favors the average indiviual
- reduces variation in a population

Question 3

Define Directional selection

Answer 3

Favors one of the extrem variations

Question 4

Define Disruptive selection

Answer 4

Favor both extremes of a variation
- 2 new species evolve

Question 5

Define speciation

Answer 5

the evolution of a new species

Question 6

When does speciation happen?

Answer 6

when 2 similar populations can no longer interbreed

Question 7

Define geographic isolation

Answer 7

When 2

Question 8

Define adaptive radiation

Answer 8

when 1 species evolves into many different species because of different environments

Question 9

Define Divergent evolution

Answer 9

A pattern of evolution where 1 species evolves into different species with different traits

Question 10

what structures show divergent evolution?

Answer 10

Homologous structures (are similar internally)

Question 11

Defene convergent evolution

Answer 11

where unrelated organisms evolve into forms that resemble each other

Question 12

What structures show convergent evolution?

Answer 12

Analogous structures (are similar externally)

Question 13

Define gradualism

Answer 13

Species evolve through a slow, steady change in adaptations

Question 14

Define punctuated equilibrium

Answer 14

Species evolve quickly, in rapid bursts, and than there are long periods with no change