Chapter 21 Bio Launchpad – Flashcards
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____________ refers to a system in which individuals select their mates according to phenotype
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assortative mating
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Both Charles Darwin and Alfred Russel Wallace acknowledged the influence of the economist Thomas Malthus in the development of their ideas about natural selection. Specifically, Malthus' ideas about geometric population growth implied that:
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resources in every generation would be limited, so individuals in every generation would have to compete for those resources
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Genetic drift is the ____________ in allele frequencies from generation to generation and is especially important in ____________ populations.
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random change; small
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What does it mean to say that an allele is "fixed" in the population?
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It is an indication of no genetic variation at that locus in the population
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When the conditions of the Hardy-Weinberg equilibrium are met: (select all correct choices)
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gene frequencies in the population do not change over time.
evolution does not occur.
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At the genetic level, evolution is
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a change in the frequency of an allele or genotype over time
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The non-adaptive mechanisms of evolutionary change are
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mutation, genetic drift, and heterozygote advantage
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In New Mexico, large expanses of black lava create patches of unique habitat. If, in every generation, selection favors the darkest colored pocket mice in those habitats because they are best hidden from predators, this would be an example of:
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directional selection
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If a population is not in Hardy-Weinberg equilibrium, we can conclude that:
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evolution has occurred because one of the assumptions of the Hardy-Weinberg equilibrium has been violated.
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Which of the following is NOT a condition of the Hardy-Weinberg equilibrium?
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No migration
Random mating
No differences in the survival and reproductive success of individuals
***All of the conditions listed ARE conditions of the Hardy-Weinberg equilibrium.
No mutation
