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Microevolution - Mechanisms of Evolution

Quiz by Daniel Genesee

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14 questions
Show answers
  • Q1
    Which mechanism of evolution is capable of producing adaptations over successive generations?
    mutation
    gene flow (migration)
    genetic drift
    natural selection
    45s
  • Q2
    Which mechanisms cannot operate unless there is genetic variation?
    mutation and migration
    genetic drift and natural selection
    mutation and natural selection
    genetic drift and natural selection
    45s
  • Q3
    In relation to natural selection, evolution is the
    process
    purpose
    outcome
    mechanism
    45s
  • Q4
    The occurrence of large or small beak sizes among seed crackers in the absence of medium-sized beaks is an example of
    none of the above
    directional selection
    stabilizing selection
    disruptive selection
    45s
  • Q5
    The movement of new genes into a population as a result of migration
    gene flow
    bottleneck effect
    genetic drift
    founder effect
    45s
  • Q6
    A virus killed most of the seals in the North Sea (e.g., dropped the population from 8000 to 800). In an effort to help preserve the species, scientists caught 20 seals and used them to start a new population in the northwest Pacific Ocean. Which of the following factors would most likely have the least impact in this new population?
    genetic drift
    bottleneck effect
    random mating
    founder effect
    120s
  • Q7
    A population that has achieved genetic equilibrium (i.e. is not evolving) according to the modern synthesis must meet all but which of the following criteria
    mating must be random
    the size of the population is small
    there is no influx of genes from other populations
    no genotype has selective advantage over another
    60s
  • Q8
    Which statement most accurately reflects what population geneticists refer to as "fitness"?
    Fitness reflects the number of mates each individual of the population selects.
    Fitness is the measure of an organism's adaptability to various habitats.
    Fitness refers to the relative health of each individual in the population.
    Fitness is a measure of the contribution of a genotype to the gene pool of the next generation.
    45s
  • Q9
    Which one of the following would disturb genetic equilibrium (i.e. Hardy-Weinberg equilibrium)
    The size of the population is very large.
    Individuals mate with one another at random.
    Natural selection is present.
    There is no source of new copies of alleles from outside the population.
    45s
  • Q10
    The effects of genetic drift are most apparent in small populations.
    False
    True
    45s
  • Q11
    Evolution results in progress; organisms are always get better through evolution.
    True
    False
    45s
  • Q12
    Genetic drift only occurs in small populations.
    True
    False
    30s
  • Q13
    Natural selection gives organisms what they need.
    True
    False
    30s
  • Q14
    Natural selection is about survival of the very fittest individuals in a population.
    False
    True
    45s

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