Exam #2

Question 1

T/F Natural Selection is a differentiating force

Answer 1

T

Question 2

T/F Natural Selection is a homogenizing force

Answer 2

F

Question 3

T/F Gene flow is a homogenizing force

Answer 3

T

Question 4

T/F Gene flow is a differentiating force

Answer 4

F

Question 5

Which species concept is concerned with distinguishable (by ordinary means) traits for species separation?

Answer 5

Morphological Species Concept

Question 6

T/F Cryptic Species: one of two or more morphologically indistinguishable biological groups that are incapable of interbreeding

Answer 6

T

Question 7

T/F genetic drift is a homogenizing force

Answer 7

F

Question 8

T/F Natural selection is random

Answer 8

F

Question 9

T/F Natural selection is not random

Answer 9

T

Question 10

Which species concept is concerned with the reproductive isolation of a species?

Answer 10

Biological Species Concept

Question 11

T/F genetic drift is a change in the frequency of a gene variant (allele)

Answer 11

T

Question 12

T/F Genetic Drift is random

Answer 12

T

Question 13

T/F Genetic Drift is not random

Answer 13

F

Question 14

How does gene flow in plants occur?

Answer 14

by dispersal of seeds or pollen

Question 15

The morphological species concept (MSC)

Answer 15

species are the smallest groups that are consistently and persistently distinct and distinguishable by ordinary means

Question 16

Dichotomous Key

Answer 16

A key for the identification of organisms based on a series of choices between alternative characteristics

Question 17

Cryptic Species

Answer 17

one of two or more morphologically indistinguishable biological groups that are incapable of interbreeding

Question 18

The Biological Species Concept

Answer 18

A species is a group of interbreeding natural populations that is reproductively isolated from others

Question 19

Why do we categorize species using reproductive isolation?

Answer 19

Reproductive barriers maintain the integrity of a species group of population. The strength of this barrier determines the impact of homogenizing and differentiating forces

Question 20

What type of force is gene flow?

Answer 20

homogenizing force

Question 21

Gene flow

Answer 21

the exchange of dna between populations, groups, species (normally restricted to reproduction)

Question 22

How does gene flow in animals occur?

Answer 22

By dispersal to new populations or stop-overs

Question 23

What type of force is natural selection?

Answer 23

differentiating

Question 24

Natural selection

Answer 24

the gradual process by which traits become more of less common in a population as a function of the effect of inherited traits

Question 25

Genetic Drift

Answer 25

change in the frequency of a gene varient (allele) inb a population due to random sampling

Question 26

what type of force is genetic drift?

Answer 26

differentiating

Question 27

the neutral theory of evolution

Answer 27

most of the variation within and between species is the result of mutation and random processes (genetic drift) leading to rise and fall of genetic variants. Smaller populations are more affected than large

Question 28

Are smaller or larger populations more effected by genetic drift?

Answer 28

small

Question 29

Founder effect

Answer 29

the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population

Question 30

genetic bottleneck

Answer 30

a sharp reduction in the size of a popualtion due to environmental events (such as volcanoes, floods, fires, droughts, etc)resulting in the reduction of the variation in the gene pool