Lecture 3

Front 1

In a small group of animals, the only individual with a particular allele is killed in an accident; this is an example of ________.

Back 1

genetic drift

Front 2

We are sending a small number of dogs to colonize a new planet. Through a random selection process, we end up only with dachshunds and chihuahuas. The subsequent colony of dogs are all small with short legs. This is an example of

Back 2

adaptive radiation

Front 3

In the Hardy-Weinberg equation, p2 is the:

Back 3

frequency of homozygous dominant individuals

Front 4

The contribution an individual makes to the gene pool of the next generation relative to the contributions of other individuals is called

Back 4

relative fitness

Front 5

Genetic drift will have a progressively larger impact on allele frequencies in a population as

Back 5

population size decreases

Front 6

The agents of microevolutionary change are

Back 6

natural selection

genetic drift

gene flow

mutation

Front 7

If there are two alleles for a gene in a population, and the frequency of the dominant allele (p) is .5, then the frequency of the recessive allele (q) is

Back 7

0.5

Front 8

Inheritability of phenotypic variation

Back 8

Only genetically-based variation is subject to evolutionary change.

Front 9

Natural selection results in

Back 9

adaptation

Front 10

Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease, a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called

Back 10

a genetic bottleneck

Front 11

processes that will disrupt Hardy-Weinberg equilibrium are

Back 11

natural selection

migration

non-random mating

genetic drift

Front 12

In pea plants, if the allele frequency for purple flowers is 0.6 what is the allele frequency for white flowers? (Assume two alleles only.)

Back 12

0.4

Front 13

Evolution can be said to have taken place when

Back 13

a population experiences a shift in allele frequencies.

Front 14

The Hardy-Weinberg formula is valuable for the calculation of changes in

Back 14

allele frequencies

Front 15

Directional selection favors

Back 15

phenotypes at one end of the distribution

Front 16

what will disrupt Hardy-Weinberg equilibrium the least?

Back 16

stabilizing selection

Front 17

Inbreeding is due primarily to

Back 17

non-random mating.

Front 18

In a colony of 100 guinea pigs, 16 show the recessive trait of bristly hair. What is the percentage of heterozygotes in the population?

Back 18

48 percent

Front 19

In frequency-dependent selection, highest mortality can be expected in

Back 19

the most abundant genotype.

Front 20

Adaptive evolution is constrained because natural selection acts on ________.

Back 20

existing genetic variation plus new mutations

Front 21

Sometimes the most abundant color form of an animal is preyed upon more extensively than less common forms. This illustrates the phenomenon of

Back 21

frequency dependent selection

Front 22

Natural selection acting on a population may NOT favor

Back 22

obligate asexually reproducing organisms

Front 23

What is the correct expression of the Hardy-Weinberg equation?

Back 23

p2 + 2pq + q2 = 1

Front 24

n the Hardy-Weinberg equation "2pq" represents

Back 24

the heterozygous genotypes

Front 25

People with the disease known as sickle-cell anemia are often better able to survive malaria because of

Back 25

heterozygote advantage