A Number of Mosquito Populations Today Are Resistant to Specific

question 15

Multiple Choice

A number of mosquito populations today are resistant to specific insecticides,even though those insecticides were highly effective when they were first introduced.Biologists believe that insecticide resistance evolved in mosquitoes because

• A) individual mosquitoes built up an immunity to an insecticide after being exposed to it.
• B) mosquitoes needed to develop insecticide resistance to survive after the insecticide was used.
• C) a few mosquitoes were probably resistant to the insecticide before it was ever used.These survived and passed that trait on to their offspring.
• D) the presence of the insecticide caused some mosquitoes to develop resistance;they survived and passed the trait to their offspring.
• E) current mosquito populations are phenotypically variable and exhibit different levels of fitness in different environments.

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Definitions:

Average Variable Cost

The per-unit cost that varies, calculated through the division of total variable costs by the quantity of products made.

Economic Profits

The financial gain made in a transaction after accounting for both explicit and implicit costs.

Average Total Cost

The total cost of production divided by the quantity of output produced, representing the average cost per unit of output.

MC = MR

Stands for the economic principle where Marginal Cost (MC) equals Marginal Revenue (MR), a condition for profit maximization in firms, indicating the optimal level of production.