Major genes contributes disease resistance in the form of
A. Vertical resistance
B. Horizontal resistance
C. Both A and B
D. None of these
Answer: Option A
Solution(By Examveda Team)
Major genes contribute to disease resistance in the form of Vertical resistance.A plant variety that exhibits a high degree of resistance to a single race, or strain, of a pathogen is said to be vertically resistant; this ability usually is controlled by one or a few plant genes.
One or a few major role genes that could be sufficient to make a plant resistant to a pathogen is referred to as R-gene, monogenic, oligogenic, or vertical resistance.
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B. Cyanobacteria
C. Purple nonsulphur bacteria
D. Green sulphur bacteria
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