Homework SourseWhich of the following is an example of geneforgene resistan
Which of the following is an example of gene-for-gene resistance?
| The ability of a plant to defend itself against many strains of a pathogen. | |
| A nonspecific response of the plant to a pathogen. | |
| The presence of an allele in the plant that corresponds to that in the pathogen. | |
| The interaction among R genes of the pathogen and Avr genes of the plant. | |
| The interaction among R genes of the plant and Avr genes of the pathogen. |
Solution
Choice 5 is correct.
Reason: Molecular interaction between genes of different species is a classical example of gene to gene interaction between organisms. One such trend is exemplified by the interaction between plants and their pathogens. It has been found by researchers that the plants comprise of a resistnace gene (R) and the pathogen comprises of an avirulence gene (Avr) which interact with each other and determine whether infection will take place in a plant due to the pathogen or not. This phenomenon has led to development of the idea that many genes have been scattered in the living organisms which show molecular compatibility to each other and regulate the net outcome of their interaction by up-regulating or down-regulating a process.
