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Genetic Variation quiz #2

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Termini in questo insieme (30)

  • What is a gene pool?
    A gene pool is the complete set of genetic information, including all alleles, present in a population.
  • What process typically decreases genetic variation?
    Genetic drift
  • How does genetic diversity affect a population's ability to adapt?
    It enhances a population's ability to adapt to changing environments.
  • What is not a source of genetic variation?
    Natural selection
  • Which would most likely result in an increase in genetic variation in a population? A) Inbreeding B) Mutation C) Genetic drift D) Stabilizing selection
    B) Mutation
  • What process contributes to the genetic variation of a species?
    Sexual reproduction
  • Which two processes increase genetic variation? A) Mutation and genetic drift B) Mutation and sexual reproduction C) Genetic drift and natural selection D) Gene flow and genetic drift
    B) Mutation and sexual reproduction
  • One of the following is not a source of genetic variation: A) Mutation B) Sexual reproduction C) Genetic drift D) Natural selection
    D) Natural selection
  • How does genetic diversity affect a population’s chances of survival?
    Genetic diversity increases a population's ability to adapt to environmental changes, enhancing survival chances.
  • What process is most likely to create genetic variation in a population?
    Mutation
  • Genetic variation in a population refers to which of the answer choices? A) Differences in physical traits B) Differences in DNA sequences C) Differences in environmental conditions D) Differences in population size
    B) Differences in DNA sequences
  • What process does not increase genetic variation?
    Inbreeding
  • What is an example of neutral variation in mutations?
    A mutation that has no effect on fitness
  • What process may produce new phenotypic variations in a population?
    Mutation
  • Which processes contribute to both the increase and decrease of allele variation?
    Mutation and genetic drift
  • How does inbreeding depression decrease a population's fitness?
    Inbreeding depression decreases fitness by increasing the likelihood of deleterious alleles being expressed, reducing genetic diversity.
  • What is a true statement concerning genetic variation?
    It is essential for evolution.
  • How does a haplontic plant population maintain genetic diversity?
    A haplontic plant population maintains genetic diversity through sexual reproduction, which introduces new allele combinations.
  • Which factor would most likely disrupt genetic equilibrium in a large population? A) Mutation B) Genetic drift C) Sexual reproduction D) Gene flow
    B) Genetic drift
  • How is genetic variation maintained in most populations?
    Genetic variation is maintained through mutation, sexual reproduction, and gene flow, which introduce new alleles and combinations.
  • Which best explains the genetic similarities between species?
    Genetic similarities between species are explained by common ancestry and shared evolutionary history.
  • Which process does not lead to genetic variability?
    Stabilizing selection
  • In what way is a gene pool representative of a population?
    A gene pool represents the total genetic diversity and allele frequencies within a population.
  • Why is a genetically diverse population more likely to survive a change to the environment?
    A genetically diverse population is more likely to survive environmental changes due to a wider range of adaptive traits.
  • What is true of continuous variation?
    It is influenced by multiple genes.
  • What influences continuous phenotypic variation?
    It is influenced by multiple genes and environmental factors.
  • Which process does not result in a decrease of genetic variation?
    Mutation
  • Which scenario decreases the genetic variation of a population?
    Genetic drift
  • What are the primary sources of genetic variation in a population, and how do they contribute to evolution?
    The primary sources of genetic variation are mutations and sexual reproduction. Mutations create new alleles by altering DNA sequences, while sexual reproduction generates new combinations of alleles through recombination and independent assortment. Both processes increase genetic diversity, providing the raw material for evolution and enabling populations to adapt to changing environments.
  • Explain how recombination and independent assortment during sexual reproduction increase genetic variation.
    Recombination (crossing over) shuffles genetic material between homologous chromosomes, creating new allele combinations, while independent assortment randomly distributes chromosomes to gametes. Together, these processes ensure that offspring inherit unique combinations of alleles, increasing genetic variation within a population.