Which of the following is true of alleles?
Group of answer choices
A collection of alleles that are present in a population is called a gene pool.
When humans interfere with allele frequencies in other organisms, it is called artificial selection.
Alleles that help an organism to survive and reproduce in an environment code for adaptive traits.
Each gene can have more than two possible types of alleles in a population.
When the frequency of alleles changes over time, evolution is occurring.
Which of these would illustrate the concept of "one person's loss is another person's gain" in the area of evolution?
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A major episode of speciation as a result of the movement of land masses after the breakup of Pangea.
The widespread planetary habitat loss and global pollution through human development.
The isolation and diversification of species on an island.
A massive expansion of a previously uncommon species after a meteorite wipes out 75% of all species.
Which of the following reproductive barriers are in effect when two species are unable to produce offspring because they breed at different times of the year?
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Temporal isolation.
Evolution through natural selection causes mutation to occur in a population.
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False.
Organisms that are closely related?
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Demonstrate homology.
Share few common embryological structures during development.
Strawberries that can no longer breed with the wild (normal) type because they are now octoploid instead of diploid have undergone?
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Sympatric speciation.
Fossils are useful pieces of evidence for the theory of evolution because?
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Organisms that died out long ago may be compared with living specimens.
Older specimens are found in the lower rock layers and younger specimens are found in the upper rock layers.
Who else independently came up with the theory of evolution through natural selection besides Darwin?
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Wallace.
Natural selection?
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Operates when there is competition between organisms in a population for limited resources.
Determines which individuals survive and reproduce, thus shifting population allele frequencies over time.
May only occur if there is variation in individuals of a population.
Requires that beneficial traits are inheritable.
All of these.
Since the classical concept of a biological species doesn't work for all organisms, what alternative concept may be used?
Group of answer choices
Compare the genetic material of the organisms.
Look at the ability of organisms to successfully mate with one another.