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WorksheetsAP Ch 24
Total questions: 14
Worksheet time: 14mins
Name
Class
Date
1.
Which of the various species concepts distinguishes two species based on the degree of genetic exchange between their gene pools?
a)
phylogenetic
b)
ecological
c)
biological
d)
morphological
2.
Two species of frogs belonging to the same genus occasionally mate, but the offspring fail to develop and hatch. What is the mechanism for keeping the two frog species separate?
a)
the postzygotic barrier called hybrid inviability
b)
the postzygotic barrier called hybrid breakdown
c)
the prezygotic barrier called hybrid sterility
d)
gametic isolation
3.
The difference between geographic isolation and habitat differentiation is the
a)
amount of genetic variation that occurs among two gene pools as speciation occurs.
b)
relative locations of two populations as speciation occurs.
c)
identity of the phylogenetic kingdom or domain in which these phenomena occur.
d)
speed (tempo) at which two populations undergo speciation.
4.
Which of these should decline in hybrid zones where reinforcement is occurring?
a)
mutation rate
b)
speciation
c)
gene flow between distinct gene pools
d)
the genetic distinctness of two gene pools
5.
The most likely explanation for the high rate of sympatric speciation that apparently existed among the cichlids of Lake Victoria in the past is
a)
polyploidy
b)
habitat differentiation.
c)
introduction of a new predator.
d)
sexual selection.
6.
The most likely explanation for the recent decline in cichlid species diversity in Lake Victoria is
a)
reinforcement
b)
fusion
c)
stability
d)
geographic isolation.
7.
According to the concept of punctuated equilibrium, the "sudden" appearance of a new species in the fossil record means that
a)
speciation occurred instantaneously.
b)
speciation occurred in one generation.
c)
speciation occurred rapidly in geologic time.
d)
the species will consequently have a relatively short existence, compared with other species.
8.
In order for speciation to occur, what must be true?
a)
At least one gene, affecting at least one phenotypic trait, must change.
b)
Large numbers of genes that affect numerous phenotypic traits must change.
c)
Changes to centromere location or chromosome size must occur within the gene pool.
d)
The number of chromosomes in the gene pool must change.
9.
Which of the following factors would not contribute to allopatric speciation?
a)
Different mutations begin to distinguish the gene pools of the separated populations.
b)
The separated population is small, and genetic drift occurs.
c)
Gene flow between the two populations is extensive.
d)
The isolated population is exposed to different selection pressures than the ancestral population.
10.
Plant species A has a diploid number of 12. Plant species B has a diploid number of 16. A new species, C, arises as an allopolyploid from A and B. The diploid number for species C would probably be
a)
14.
b)
28.
c)
16
d)
56
11.
Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent?
a)
gametic isolation
b)
behavioral isolation
c)
postzygotic barriers
d)
temporal isolation
12.
Rank the following from most general to most specific:
1. gametic isolation
2. reproductive isolating mechanism
3. pollen–stigma incompatibility
4. prezygotic isolating mechanism
1. gametic isolation
2. reproductive isolating mechanism
3. pollen–stigma incompatibility
4. prezygotic isolating mechanism
a)
2, 1, 4, 3
b)
4, 1, 2, 3
c)
2, 4, 1, 3
d)
4, 2, 1, 3
13.
A hybrid zone is properly defined as
a)
a zone that features a gradual change in species composition where two neighboring ecosystems border each other.
b)
an area where mating occurs between members of two closely related species, producing viable offspring.
c)
a zone that includes the intermediate portion of a cline.
d)
an area where two closely related species' ranges overlap.
14.
Which of the following statements about speciation is correct?
a)
Speciation is a basis for understanding macroevolution.
b)
Natural selection chooses the reproductive barriers for populations.
c)
The goal of natural selection is speciation.
d)
When reunited, two allopatric populations will interbreed freely if speciation has occurred.
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