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Questions and Answers
Gene flow tends to reduce differences between ______ populations.
Gene flow tends to reduce differences between ______ populations.
neighboring
In areas where the ______ parasite is common, the frequency of the sickle-cell allele is highest.
In areas where the ______ parasite is common, the frequency of the sickle-cell allele is highest.
malarial
Heterozygous individuals are ______ to malaria.
Heterozygous individuals are ______ to malaria.
resistant
Gene flow can ______ neighboring populations into a single population with a common gene pool.
Gene flow can ______ neighboring populations into a single population with a common gene pool.
Humans today migrate much more freely than in the past, and gene flow has become an important agent of ______ change in human populations that were previously isolated.
Humans today migrate much more freely than in the past, and gene flow has become an important agent of ______ change in human populations that were previously isolated.
The frequency of the sickle-cell allele is highest in areas where the ______ parasite is common.
The frequency of the sickle-cell allele is highest in areas where the ______ parasite is common.
Alleles may be transferred that ______ the adaptation of one or both alleles to their local environment.
Alleles may be transferred that ______ the adaptation of one or both alleles to their local environment.
In some African tribes, the sickle-cell allele accounts for ______ % of the gene pool.
In some African tribes, the sickle-cell allele accounts for ______ % of the gene pool.
Frequency-dependent selection occurs when the ______ of any one morph declines if it becomes too common in the population.
Frequency-dependent selection occurs when the ______ of any one morph declines if it becomes too common in the population.
Copper-tolerant plants are at a ______ and reproduce poorly on nearby soils not contaminated with copper.
Copper-tolerant plants are at a ______ and reproduce poorly on nearby soils not contaminated with copper.
Natural selection can act only on ______ variations.
Natural selection can act only on ______ variations.
Increased ______ tolerance rapidly spreads within the local population in the bent grass population near copper mines.
Increased ______ tolerance rapidly spreads within the local population in the bent grass population near copper mines.
Gene flow has resulted in the worldwide spread of ______ -resistance alleles in the mosquito Culex pipiens.
Gene flow has resulted in the worldwide spread of ______ -resistance alleles in the mosquito Culex pipiens.
Gene flow can introduce new ______ into a population.
Gene flow can introduce new ______ into a population.
Natural selection may cause the new ______ to increase or decrease in a population.
Natural selection may cause the new ______ to increase or decrease in a population.
In some plant species, copper-______ alleles are at a disadvantage and reproduce poorly on nearby soils.
In some plant species, copper-______ alleles are at a disadvantage and reproduce poorly on nearby soils.
A barnacle may produce more eggs than its neighbors because it is more efficient at ______ food from the water.
A barnacle may produce more eggs than its neighbors because it is more efficient at ______ food from the water.
Natural selection is the only mechanism that consistently causes ______ evolution.
Natural selection is the only mechanism that consistently causes ______ evolution.
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