How do new alleles appear in an isolated population? A. Nobody knows B. Evolution C. Mutation D. Because they are advantagous
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Mutations are important for evolution because a. they may produce new abilities or functions b. they help the strong individuals c. they always prove beneficial d. they impact immigration
Adi S.
When a population evolves rapidly after the introduction of a new selective pressure (e.g., a pesticide), the alleles involved (e.g., for pesticide resistance) most typically: A. result from genetic drift when a random event (e.g., pesticide application) creates a bottleneck. B. change in frequency because of migration towards favorable habitats. C. result from mutation in response to the new selective pressure. D. were present in the population, perhaps at low frequency, before the new pressure was introduced.
What must occur in order for a new trait to appear in a population and then reach a steady, high frequency within that population? a. New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be many mutagens, such as UV radiation, in the environment to produce many mutations. b. New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be a consistent source of immigrant individuals with the allele. c. New traits appear through gene mutations or through evolution. In order to reach a steady, high frequency in the population, the allele must code for a favorable adaptation. d. New traits appear through gene mutations or through gene flow. In order to reach a steady, high frequency in the population, the trait associated with the gene must be favored by either natural or sexual selection.
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