Chpt 22 and 23 Test

Question 1

Which statement about variation is true?

Answer 1

All new alleles are the result of nucleotide variability

D

Question 2

Which statement is true concerning genetic variation?

Answer 2

It must be present in a population before natural selection can act upon the population

C

Question 3

Which of the following is not a plausible hypothesis to explain catapiller appearance?

Answer 3

Difference in air pressure

Question 4

Cystic fibrosis is a genetic disorder…what are the expected frequencies?

Answer 4

F(A1)=.97

f(A2)=.03

Question 5

For a biologist studying a large flatform in a lab which Hardy Weinberg condition is the hardest to meet?

Answer 5

No mutation

Question 6

In a Hardy Weinberg population with two alleles A and a,

Answer 6

a) .9

Question 7

Refer to the paragraph on Dark eyed junco birds…

Answer 7

Founder effect

Question 8

An earthquake decimates a ground squirrel population

Answer 8

Genetic bottleneck

Question 9

Which of the following is the most predictable outcome of increased gene flow?

Answer 9

Decreased genetic differences between the two populations

Question 10

You are maintaining a small number of fruit flies in a lab

Answer 10

Cross your flies with flies from another lab

Question 11

Currently the only predators of the Galapagos marine iguanas are hawks. Genetic factors expected to ______, iguanas would be under ______ selections

Answer 11

Decrease, directional

Question 12

Adult males genetically have deeper voices.

Answer 12

Sexual dimorphism

Question 13

Most Swiss startling produce 5 eggs in each clutch. Those producing fewer or more tend to have reduced fitness.

Answer 13

Stabilizing selection

Question 14

When imbalances occur in the sex ratio of sexual species, more care goes to the minority species

Answer 14

Frequency dependent selection

Question 15

A proficient engineer can easily design sketches that are more effective

Answer 15

Natural selection is generally limited to modifying structures that were present in previous generations (E)

Question 16

Prior to the work of Lyell and Darwin, the prevailing belief was that Earth is,

Answer 16

A few thousand years old and the population is unchanging

Question 17

If x indicates the location of fossils of two closely related species, then fossils of their most common ancestor are most likely to occur in which stratum?

Answer 17

C

Question 18

Island forms of organisms are found to be different, but similar to mainland forms of organisms

Answer 18

Island forms are descended from mainland forms (A)

Question 19

Starting from the wild mustard, breeders have created strains of brussels, sprouts, and kale

Answer 19

This shows that there is enough heritable variation to permit these different varieties (A)

Question 20

Which of these conditions are always true of populations evolving due to natural selection

Answer 20

C) Conditions 1 and 2

Question 21

Triazine herbicide and farmer…

Answer 21

D) Traizine resistant weeds were more likely to survive and reproduce

Question 22

Claytonia virginica

Answer 22

A) The percentage of white flowers should increase over time

Question 23

What is the correct sequence of following events under the influence of natural selection?

Answer 23

A) 2-4-1-3

Question 24

A biologist studied a population of squirrels for 15 years…

Answer 24

D) The amount of available food may have increased and/or the predator population could have decreased

Question 25

What has to occur before natural selection can begin?

Answer 25

Genetic variation among individuals

Question 26

Elephant phylogenic tree

Answer 26

D

Question 27

Structural similarities are an example of

Answer 27

Homology

Question 28

How can natural selection account for the lose of eyes?

Cave dweller

Answer 28

Under paticular circumstances, that persisted for long periods, each of these structures presented greater costs than benefits

Question 29

Crabs having reduced tails is an example of…

Answer 29

a vestigial trait

Question 30

Which evidence most strongly supports the idea of a common ancestor?

Answer 30

Use essentially the same genetic code