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Page 8
Rhagoletis pomonella
in the Hudson River Valley of New York State is separating into two
different groups—one that lays eggs on apples and the other that lays eggs on hawthorn fruits.
This fly species is demonstrating
A.
allopatric speciation.
B.
speciation due to directional selection.
C.
sympatric speciation due to their preference for either apple or hawthorn fruits.
D.
the formation of new species by polyploidy.
E.
the early stages of extinction
A hybrid zone between two species of butterflies contains individuals with widely varying
genotypes, ranging from those matching both parental species to those with varying proportions
of genes from the parental species. From this information you can infer that
A.
prezygotic isolating mechanisms are maintaining the hybrid zone.
B.
postzygotic isolating mechanisms are maintaining the hybrid zone.
C.
the hybrid zone is relatively old.
D.
the hybrid zone is relatively new.
E.
None of the above
1.
Suppose that the natural ranges of horses and donkeys were to overlap. Which of the following
statements best describes what would likely happen to the populations over time?
A.
The hybrid offspring (mules) would become widespread and mate with members of both
populations.
B.
The hybrid offspring would mate with other hybrid offspring to produce viable offspring.
C.
The hybrid offspring would be less reproductively fit and reinforcement could strengthen
postzygotic barriers.
D.
Eventually all members of both populations would be hybrids.
E.
The hybrid offspring would be less reproductively fit and reinforcement could strengthen
prezygotic barriers.
The biological species concept does
not
apply to which of the following groups of organisms?
A.
Birds
B.
Mammals that form monogamous pair bonds
C.
Asexual scale insects
D.
Fungi that engage in sexual reproduction
E.
Cryptic species
Which species concept could most easily be applied to fossils?
A.
The lineage species concept
B.
The biological species concept
C.
The morphological species concept
D.
None of the above
E.
All of the above


Page 9
1.
Which of the following is an assumption of the Dobzhansky–Muller model of speciation?
A.
The operation of natural selection
B.
The principle of reinforcement
C.
Interaction between alleles at different loci
D.
Chromosomal rearrangements, particularly centric fusions
E.
Temporal isolation
.
Darwin's finches on the Galápagos Islands
A.
evolved from different ancestors.
B.
are very similar to each other.
C.
are similar to their mainland ancestor(s).
D.
provide examples of allopatric speciation.
E.
provide examples of sympatric speciation.
Suppose one rodent species prefers to live on the beach and a closely related species prefers
to live on higher ground. Although each species has the capacity to move to the other location,
they remain in their locations, and therefore they do not mate with one another. These species
thus exhibit _______ isolation.
A.
behavioral
B.
temporal
C.
habitat
D.
mechanical
E.
None of the above
Homework Ch 18
1.
The first person to realize that the relative ages of rocks can be determined by examining
strata was
A.
Charles Darwin.
B.
Alfred Russel Wallace.
C.
Stephen Jay Gould.
D.
Nicolaus Steno.
E.
Alfred Wegener.
2.
Which of the following was
not
known to eighteenth- and nineteenth-century geologists?
A.
Fossil organisms found in more recent strata resemble modern organisms more than those
found in more ancient strata.
B.
Fossils of similar organisms are found in widely separated places on Earth.
C.
Radioactivity can be used to determine the age of rocks.
D.
All of the above
E.
None of the above


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