Genetics of Resistance in Plants

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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?

Monogenic recessive resistance Signup and view all the answers

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

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

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

Avoidance 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?

Avoidance Signup and view all the answers

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

Morphological or chemical characteristics Signup and view all the answers

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

Avoidance Signup and view all the answers

What does a repulsive odor in cotton do?

Deters the boll weevil from feeding on the plant Signup and view all the answers

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)?

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

How are resistance and avirulence genes usually reported to operate?

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

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

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

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

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

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

What does a repulsive odor in cotton do?

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