Unit 22-23: Evolution

Question 1

Divergent Evolution

Answer 1

share a common ancestor

Question 2

Convergent Evolution

Answer 2

phenotypes are similar, do not share a common ancestor

Question 3

Evidence of Evolution

Answer 3

Fossil records, anatomy, embryology, bio geography, molecular biology

Question 4

Gene flow

Answer 4

movement of alleles among populations, by migration, increases variation

Question 5

Kin Selection

Answer 5

the evolutionary behavior that favors the reproductive success of an organisms relatives (sisters/brothers) (altruism)

Question 6

Genetic Drift

Answer 6

changes in allele frequencies due to chance

Question 7

Bottleneck Effect

Answer 7

caused by a severe reduction in pop, reduces overall diversity

Question 8

Founder Effect

Answer 8

ex. of genetic drift where rare alleles or combos occur in higher frequency in a pop isolated from the general population (Dwarfism in Amish communities)

Question 9

Altruism

Answer 9

cooperative behavior within social groups

Question 10

Directional Selection

Answer 10

one phenotype is favored over another, causes a shift in the overall appearance of the species

Question 11

Stabilizing Selection

Answer 11

occurs when extreme phenotype are eliminated and the intermediate phenotype is favored

Question 12

Disruptive Selection

Answer 12

occurs when extreme phenotype are favored and can leaed to more than one distinct form