Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population.

Q4.15. DDT Is An Insecticide That Was Used Extensively In Agriculture In The Mid-1900s To Kill Many Insect Pests, Including The Boll Weevil (Pictured Below), Another Pest Of Commercial Cotton. DDT Was Initially Effective At Controlling Boll Weevil Outbreaks, But After About A Decade DDT Became Much Less Effective, Because Many Populations Of Boll Weevil Had

 Q4.15. DDT is an insecticide that was used extensively in agriculture in the mid-1900s to kill many insect pests, including the boll weevil (pictured below), another pest of commercial cotton. DDT was initially effective at controlling boll weevil outbreaks, but after about a decade DDT became much less effective, because many populations of boll weevil had evolved resistance to DDT. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population of boll weevils?

Boll weevils in the population learned to adapt to the high levels of DDT in the environment.

The boll weevil population needed to evolve DDT resistance in order to avoid extinction.

A few boll weevils in the population were resistant to DDT before it was ever used.

Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population.

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The agave bush and the desert tortoise are both found in the Sonora Desert in the Southwest of North America. Known as the century plant, the agave blooms in June to August but only once after about 25 years and then dies. In contrast, tortoises may live in excess of 100 years and when they reach the age of around 15 years they lay eggs between May and July at 2-3 year intervals. What type of reproductive strategy is demonstrated by each of these species? View keyboard shortcuts As previous stated, tortoises may lay multiple clutches of eggs with varying numbers per clutch depending on the amount of rainfall during the summer monsoon season in the desert. In general more rain results in 1 or two more clutches per season and more eggs per clutch. Would this be a density dependent or density independent factor with respect to population growth of tortoises and what specifically in the information above made you come to this conclusion? Desert tortoises may live up to 100 years and don't reach sexual maturity typically until 15 years of age. Based on all the information presented on tortoises in this quiz, would consider them to be more or a r or K selected species and what are two specific facts from the information presented that support your conclusion? Assume a population of desert tortoises has a per capita growth rate (r) or 0.039. If this rate could be sustained, how long would it take for the population that is currently 186 individuals to reach 450 individuals? (just give the simplest expression with the data provided)

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