Genetics of Resistance in Plants
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Questions and Answers

According to R.H. Biffen's report, what was the genetic basis of resistance to stripe rust (Puccinia striiformis)?

  • Controlled by epistatic gene interactions
  • Controlled by a single Mendelian gene (correct)
  • Controlled by additive gene effects
  • Controlled by multiple Mendelian genes

    • What type of gene action is commonly observed for resistance to pests and pathogens?

  • Recessive gene action
  • Additive gene action
  • Epistatic gene action
  • Dominance gene action (correct)

    • How are resistance and avirulence genes usually reported to operate?

  • Through additive genetic effects
  • On a gene-for-gene basis (correct)
  • By linkage in clusters
  • Through epistatic interactions

    • What is the common genetic basis for resistance to pests and pathogens, as mentioned in the text?

    <p>Monogenic recessive resistance</p> Signup and view all the answers

    How are the effects of resistance genes described in the text?

    <p>May be large or small, and may interact epistatically or additively</p> Signup and view all the answers

    What is the mechanism that reduces the probability of contact between pathogens or pests and the plant?

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

    What is primarily applicable to attacks of animal pests and also to insect pests where entomologists describe it as antixenosis?

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

    What characteristic makes a plant unattractive to insects for feeding, oviposition, or shelter?

    <p>Morphological or chemical characteristics</p> Signup and view all the answers

    What may not be effective if there are no alternative hosts?

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

    What does a repulsive odor in cotton do?

    <p>Deters the boll weevil from feeding on the plant</p> Signup and view all the answers

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