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Evolution of Populations

Total questions: 34

Worksheet time: 42mins

Name
Class
Date
1.
What do you call all of the genes in a population?
a)
Gene pool
b)
Relative Frequency
c)
Genetic Drift
d)
Allele pool
2.
Many members of one species in an area
a)
ecosystem
b)
community
c)
biodiversity
d)
population
3.
Which of the three graphs shows directional selection?
a)
A
b)
B
c)
C
4.
A population of pigs with small, medium, and long snouts lives on an island together with burrowing termites. Pigs that have the longest snouts tend to survive better. Over time, most of the pig population is made up of individuals that have very long snouts. This is an example of which type of selection?
a)
directional selection
b)
disruptive selection
c)
stabilizing selection
d)
sexual selection
5.
In the past, individuals in a population of seed eating birds had a wide variety of beak sizes. After many generations, the birds either have small beaks or large beaks, but medium size beaks are absent. If the number of birds with each beak size was graphed which example would it look like?
a)
A
b)
B
c)
C
6.
Which condition would help maintain genetic equilibrium?
a)
natural selection
b)
mutation
c)
emigration
d)
large population
7.
A chance occurrence that negatively affects a population because the population is small.
a)
genetic drift
b)
mutation
c)
speciation
d)
migration
8.
The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called
a)
the Hardy-Weinberg principle
b)
the founder effect
c)
directional selection
d)
the bottleneck effect
9.
Which IS NOT a source of genetic variation?
a)
mutations
b)
genetic recombination
c)
horizontal gene transfer
d)
genetic drift
10.
Yellow toucan birds seek out one another to make babies together and tend to avoid the green toucan birds.
a)
Genetic Drift
b)
Sexual Selection
c)
Gene flow
d)
Mutation
11.
When individuals with an average form of a trait have the highest fitness, the result is
a)
stabilizing selection
b)
disruptive selection
c)
not predictable
d)
directional selection
12.
Populations of the same species living in different places
a)
always show balancing selection
b)
become increasingly different as each population becomes adapted to its own environment
c)
are genetically identical to each other
d)
do not vary
13.
What is speciation?
a)
  The process by which populations become geographically isolated
b)
The process in which reproductively isolated populations evolve to become distinct species
c)
The process in which reproductively isolated populations do not evole
d)
None of these
14.
A horse and a donkey can successfully mate to produce offspring known as a mule.  Mules are sterile .  Would mules be classified as a species?
a)
Yes, mules have enough of their own traits to be considered a species.
b)
Yes, the fact that have different number of chromosomes makes them a different species
c)
No, mules are too similar to the parent species
d)
No, due to their inability to reproduce successfully.
15.
Group of organisms capable of interbreeding and producing fertile offspring.
a)
species
b)
gene pool
c)
population
d)
homologous structure
16.
What is geographic isolation?
a)
Members of a population live together within an geographic boundary
b)
Members of a population may become isolated from one another by geographic boundaries
c)
An isolation that is geographic
d)
None of these
17.
If coat color in a rabbit population is a polygenic trait, which process might have produced the graph below?
a)
disruptive selection
b)
stabilizing selection
c)
directional selection
d)
genetic equilibrium
18.
a measure of how commonly a particular allele occurs in a population is known as the 
a)
gene pool
b)
allele frequency
c)
mutation rate
d)
phenotype
19.
Temporal isolation occurs when two different populations
a)
develop different mating behaviors
b)
become geographically separated
c)
reproduce at different times
d)
interbreed
20.
Two groups of chipmunks cannot mate anymore because the grand canyon separates them; this is
a)
Behavioral isolation
b)
Geographic isolation
c)
Temporal isolation
d)
Mechanical isolation
21.
The cardinal and the blue jay do not reproduce due to a difference in their mating songs.  This is an example of 
a)
geographic isolation
b)
habitat isolation
c)
gametic isolation
d)
behavioral isolation
22.
A population in genetic equilibrium
a)
reproduces sexually
b)
undergoes genetic drift
c)
has a high rate of mutation
d)
must mate randomly
23.
In a single-gene trait, if the dominant allele increases by 15% over a particular period, the recessive allele 
a)
will increase by 15%
b)
will decrease by 15%
c)
will stay the same
d)
will change in an unpredictable manner
24.

Mutations that improve an individual's ability to survive and reproduce are

a)

harmful

b)

neutral

c)

beneficial

d)

chromosomal

25.

Traits, such as human height, that are controlled by more than one gene are known as

a)

single-gene traits.

b)

polygenic traits.

c)

recessive traits.

d)

dominant traits.

26.

A random change in the allele frequency of a small population is known as

a)

a gene pool

b)

genetic drift.

c)

variation.

d)

fitness

27.

When two populations no longer interbreed what is the result?

a)

genetic equilibrium

b)

reproductive isolation

c)

stabilizing selection

d)

artificial selection

28.

Each "tick" of a molecular clock is an occurence of

a)

genetic drift.

b)

crossing-over

c)

DNA mutation

d)

mitosis

29.

Hox genes

a)

can produce large changes in adult animals during their embryological development

b)

code for proteins with no known function.

c)

have never gone through the process of crossing-over

d)

are duplicate genes that are always responsible for speciation

30.

Neutral mutations

a)

are not useful to evolutionary biologists.

b)

tend to accumulate in the DNA of different species at about the same rate.

c)

affect the expression of Hox genes.

d)

are under powerful selection pressure.

31.

Among the finch populations of the Galápagos islands, the founder effect, reproductive isolation and competition all contributed to

a)

speciation

b)

genetic equilibrium

c)

stabilizing selection

d)

genetic drift

32.

Natural selection can act directly on

a)

alleles

b)

genes

c)

mutations

d)

phenotypes

33.

Multiple copies of a duplicated gene can turn into a group of related genes referred to as a

a)

chromosomal mutation

b)

Hox gene

c)

gene family

d)

polygenic trait

34.

Genetic equilibrium requires

a)

Dominant and recessive alleles have equal frequencies

b)

genetic diversity and adaptations

c)

natural selection

d)

stable, unchanging allele frequencies

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