Choose Correct Species and Speciation Flashcards

A change in climate brings two formerly separated populations of beetles together. The two beetles look very similar. Under the biological species concept, which of the following would indicate that the two populations are actually different species?
Student Response Value Correct Answer A. One population breeds in the spring, the other in the fall.
B. Males of the two populations have different flight patterns in courtship.
C. When individuals from the two populations mate with each other in the laboratory, the eggs fail to hatch.
D. All of the above are evidence the two populations are actually different species under the biological species concept.

In order for the gene pools of two closely related species to remain distinct, there must be
Student Response Value Correct Answer A. a geographic barrier between them.
B. enough natural selection to offset the effects of gene flow.
C. enough genetic drift to compensate for migration.
D. some form of reproductive isolation.

The modern polar bear species evolved from an ancestral bear population in southern Alaska that became separated by glaciers from bear populations in the rest of North America. This type of event is called
Student Response Value Correct Answer A. sympatric speciation.
B. temporal isolation.
C. mechanical isolation.
D. allopatric speciation.

Sympatric speciation
Student Response Value Correct Answer A. can occur due to an increase in the number of sets of chromosomes.
B. is the primary mechanism by which new animal species form.
C. initially involves a physical barrier separating two populations that prevents gene exchange.
D. takes a very long time to produce separate species.

If two species are able to interbreed but produce sterile hybrids, the barrier between these species is maintained by
Student Response Value Correct Answer A. gametic isolation.
B. a postzygotic barrier.
C. hybrid inviability.
D. a prezygotic barrier.

Organisms able to breed to produce fertile offspring are considered members of the same species according to the
Student Response Value Correct Answer A. biological species concept.
B. evolutionary species concept.
C. phylogenetic species concept.
D. ecological species concep

DNA sequence data would be most in categorizing organisms into species according to the
Student Response Value Correct Answer A. biological species concept.
B. ecological species concept.
C. evolutionary species concept.
D. phylogenetic species concept.

Incompatible genitalia, different geographical distributions, failure of fusion of gametes, and different mating times exhibited by different populations can all serve as
Student Response Value Correct Answer A. ways to form cross-species hybrids.
B. prezygotic reproductive isolating mechanisms.
C. postzygotic reproductive isolating mechanisms.
D. mechanisms to promote gene flow among species.

Polyploidy
Student Response Value Correct Answer A. can creates separate species in a single generation.
B. involves an increase in entire sets of chromosomes.
C. can result from hybridization between different species.
D. All of the above.

Under the allopatric model of speciation, which of the following evolutionary forces will not be an important contributor to the creation of new species?
Student Response Value Correct Answer A. genetic drift
B. gene flow
C. mutation
D. natural selection

Evolutionary developmental biology (“evo-devo”) involves studying
Student Response Value Correct Answer A. the evolution of an organism as it develops into an adult.
B. developmental mechanisms that bring about evolutionary change within an individual.
C. how distinct body plans are a result of regulatory genes being expressed in differently organisms.
D. phylogenetic trees based on sequence similarities.

2. Species & speciation 12 The set of thirteen species of finches on the Galápagos islands is an example of
Student Response Value Correct Answer A. convergent evolution.
B. mutualism.
C. mimicry.
D. adaptive radiation.

The pattern of evolution characterized by the splitting of lineages is known as
Student Response Value Correct Answer A. cladogenesis.
B. anagenesis.
C. punctuated equilibrium.
D. directional selection.

Speciation is probably least likely to occur on
Student Response Value Correct Answer A. a small homogeneous island.
B. two small islands distant from one another.
C. a large ecologically diverse continent.
D. several large ecologically diverse continents.

Two species of animals that occupy the same area are said to be
Student Response Value Correct Answer A. allopatric.
B. sympatric.
C. sister species.
D. polymorphic.
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