Viral Genetic Mutations: Antigenic Drift and Shift
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Questions and Answers

What is the term used to describe minor changes in a virus due to mutations in its DNA or RNA?

  • Antigenic shift
  • Point mutations (correct)
  • Recombination
  • Resistant mutations
  • When two genetically distinct viruses infect a cell, what process results in a major change in the virus's genome?

  • Recombination
  • Genetic interaction
  • Antigenic drift
  • Antigenic shift (correct)
  • What type of genetic interaction among viruses results in progeny with traits not found in either parent?

  • Antigenic shift
  • Point mutations
  • Antigenic drift
  • Recombination (correct)
  • Which mechanism involves the exchange of genetic material between different chromosomes or regions within the same chromosome in viruses?

    <p>Recombination</p> Signup and view all the answers

    What kind of mutations do not change the protein encoded by a gene in a virus?

    <p>Silent mutations</p> Signup and view all the answers

    In which type of viruses does recombination generally occur, mediated by homology?

    <p>ds DNA viruses</p> Signup and view all the answers

    What is the classic mechanism of recombination?

    <p>The nucleic acid strands break, and parts of the genomes from two parents are joined.</p> Signup and view all the answers

    What is the process called when two chromosomes (M and F) break and rejoin to produce two re-arranged chromosomes (C1 and C2)?

    <p>Recombination of incompletely linked genes</p> Signup and view all the answers

    What is the characteristic of a recombinant virus with a stable genome?

    <p>It yields progeny that are genetically similar to itself upon replication.</p> Signup and view all the answers

    For viruses with segmented genomes (RNA viruses), how is the formation of recombinants caused?

    <p>By reassortment of individual genome fragments rather than by an actual crossover event</p> Signup and view all the answers

    What is the evolutionary advantage conferred by segmented genomes in viruses like influenza?

    <p>Different strains can shuffle/mix and combine genes to produce offspring with unique characteristics.</p> Signup and view all the answers

    What is the process called when different strains of a virus with a segmented genome shuffle/mix and combine genes to produce offspring with unique characteristics?

    <p>Reassortment or viral sex</p> Signup and view all the answers

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