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Which of the following best defines a gene pool?
A
the sum of all genetic traits in a population’s individuals at a given timeB
any movement of genes from one population to anotherC
any movement of organisms from one environment to anotherD
the random change in the frequency of an allele in a population22
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Which of the following is an example of reproductive isolation?
A
two populations of finches that cannot produce viable offspringB
two populations of finches that have different feather colorsC
two populations of salamanders that live in different lakesD
two populations of salamanders that have different tail lengths23
Babies with very low or very high birth weight are less likely to survive. The graph shows the percentage of babies born at different weights.Which statement is a valid claim that could be made using the data in the graph?
A
Directional selection is occurring because the graph favors an extreme.B
Stabilizing selection is occurring because the average is favored.C
Disruptive selection is occurring because the two extremes are favored.D
Biodiversity variation is occurring because there is an increase in trait variation.24
Evolution is change in a population over time and includes the gene pools of that population. How does biogeographic isolation allow for the change of gene pools over time?
A
Biogeographic isolation affects the random changes that take place within gene pools.B
Biogeographic isolation causes changes in gene pools that result from populations being separated.C
Biogeographic isolation determines who will win competition for mates.D
Biogeographic isolation determines the time that populations will breed.25
A student argues that being separated geographically is the only way for speciation to occur. Why is he wrong?
A
Speciation does not usually rely on geographic isolation.B
Speciation can occur from biological forces as well.C
Speciation can occur from variation as well.D
Speciation does not result from adaptive radiation.Did you find these answers helpful?
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