lect_quiz3

lect_quiz3 - The pathogen disease progress curve will...

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1 Name_________ PP 315 – Lecture Quiz #3 1. Define complete resistance? How does the use of complete resistance change the pathogen population? (2pts) BONUS: HOW? (1pt) Complete resistance is the ability of a host to prevent infection by a pathogen. Complete resistance reduces the pathogen population by preventing the pathogen from establishing on a host and allowing it to reproduce. 2. Define aggressiveness? What type of host resistance results in shifts in pathogen aggressiveness? (2pts) BONUS: HOW? (1pt) Aggressiveness is how fast a pathogen can infect a host and then reproduce to spread. Complete resistance decreases aggressiveness by preventing reproduction of the pathogen. 3. What is the gene-for-gene hypothesis? Draw a quadratic check to illustrate this interaction. (2 pts) For each resistance present in a host there is an avirulence in a pathogen.
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Unformatted text preview: The pathogen disease progress curve will increase and then decrease forming a zigzag pattern. 4. What is a disease gradient? How is it different from a Disease Progress curve? (2 pts) A disease gradient shows the spread of disease in an area. A disease progress curve is shows the intensity of a disease. 5. What is an agroecosystem? List 3 characteristics of agroecosystems that make them more favorable for disease development than natural ecosystems. (2pts) An agroecosystem is an independent community that has very little change because of management practices by humans. Natural predators are eliminated, hosts do not build resistance because they are constantly replaced, there are more host plants that are the same and are densely packed in a small area....
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This note was uploaded on 03/22/2008 for the course PP 315 taught by Professor Shew during the Spring '08 term at N.C. State.

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