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A population of Anopheles mosquitoes reaches very high densities, and is subjected to aerial spraying by DDT. The following six years, the mosquitoes are not observed at all, but the population was sprayed "just in case". An outbreak occurs seven years later, however, and this time, the aerial spraying with DDT is much less effective. Laboratory tests indicate that these mosquitoes are resistant to DDT, avoiding surfaces coated with it. It also seems that, in the absence of DDT, they have a reduced growth rate and lower fertility than mosquitoes collected before the spraying. Field ecologists report that virtually every predatory insect has been eliminated from the regions sprayed with DDT.
a) What type of evolutionary event has occurred here? What was the likely mechanism for the change in the mosquito population?
b) What recommendations would you make as a mosquito control strategy for the future.
Explain how cells meet their energy requirements through the process of fermentation in absence of oxygen along with the examples.
Describe the event that are invovled in the release of neurotransmitter from nreve endings?
Beginning at the esophagus, trace the pathway of food through the system. At each organ, indicate anatomical adaptations to the general GI tract tube structure that enhance the specific functions of the organs.
For each of the following anticodon sequences, identify the codon sequence to which it could potentially pair using third base wobble.
Determine which phase of the ventricular myocyte action potential would you expect to be most affected by verapamil? Why? What would the end result of this be?
Suppose brown fur is dominant to blonde fur and these are only possible phenotypes, in a population of mice where 332 are blonde and 826 are brown.
Sanger-based sequencing needs very specific DNA and primer concentrations for optimal performance. For template DNA like plasmids, DNA needs to be at a concentration of 50ng/ul in 10 ul.
Why is the gene coding for ribosomal RNA used for establishing phylogenetic relationships and how does this compare to previous methods for placing organisms in appropriate taxa
Suppose your cousin has decided to begin breeding owls. She does some research and finds out that a single gene controls feather color.
How several bacteria were on the soap? How did they get there. Unlike squamous cells, cuboidal and columnar cells have large, open cytoplasms. Which functions of epithelial tissue are supported by having such big cells.
Provide many examples of soluble and insoluble dietary fibers. List food sources of these fibers. Contrast the physical characteristics and features of these two types of fiber and their effects on gastrointestinal tract function.
though , certain pairs of his progeny, when interbred, produced red and white progeny at a frequency of about 25 percent. Nick was soon removed from the stud lists of the Holstein breeders. Explain why, using symbols.
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