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Question 1

A gene in Hardy-Weinberg equilibrium has only two alleles. The frequency of one homozygote is 0.16, or 16%. What will be the frequency of heterozygotes?

Answer 1

.48

Question 2

Which process is the result of sampling error in finite populations?

Answer 2

genetic drift

Question 3

Which of these is not a prezygotic isolating mechanism?

Answer 3

hybrid sterility

Question 4

Pleiotropy occurs when:

Answer 4

one gene simultaneously affects multiple traits

Question 5

Mutations arise stochastically. This means that:

Answer 5

the chance a mutation occurs is not affected by whether it is advantageous or not

Question 6

Which of the following is not a necessary condition for natural selection to occur?

Answer 6

assortative mating

Question 7

Which statement is true?

Answer 7

natural selection cannot follow a predetermined path

Question 8

Protists form a paraphyletic group.

Answer 8

TRUE

Question 9

In giraffes, the recurrent laryngeal nerve makes a needless detour of about 15 feet.

Answer 9

True

Question 10

Intrasexual selection in nature most commonly occurs as:

Answer 10

male-male competition

Question 11

Pathogenic (disease-causing) bacteria found in many hospitals are quite resistant to antibiotics. This is best described as an example of:

Answer 11

directional selection

Question 12

Reversals to the usual forms of sexual selection are expected when:

Answer 12

male investment in offspring is high

Question 13

What is the name of the mating system in which successful females typically mate with multiple males during a breeding season, but a male typically mates with one female?

Answer 13

polyandry

Question 14

Two individuals are homozygous for different alleles at two genes (AABB vs. aabb). How many different genotypes are possible among their F2 progeny?

Answer 14

9

Question 15

Which type of macromutation is especially important in the evolution of gene families?

Answer 15

duplications

Question 16

This figure illustrates:

Answer 16

vestigial character

Question 17

Which process is the ultimate source of genetic variation?

Answer 17

mutation

Question 18

Which of these conditions should completely prevent the occurrence of evolution by natural selection?

Answer 18

all phenotypic variation among individuals is caused by environmental factors

Question 19

Frogs are more closely related to fish than they are to humans.

Answer 19

false

Question 20

Which phenomenon causes significant divergence between the genetic make-up of an individual’s gametes and the genetic make-up of the gametes that produced the individual in the first place?

Answer 20

recombination

Question 21

The figure above indicates:

Answer 21

auto polyploidy

Question 22

When we reconstruct phylogenies using morphological traits, we need to rely on characters that are both unique and derived.

Answer 22

false

Question 23

What is the type of allopatric speciation in which gene-flow barriers arise without dispersal?

Answer 23

vicariant speciation

Question 24

Which of the necessary conditions for natural selection is not illustrated in this figure?

Answer 24

underlying genetic variation