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Recently, an outbreak of West Nile virus in crows living in upstate NY was reported. Since mosquitoes are the carriers, an outbreak of WN virus is not expected in mid-February. Nine dead crows all tested positive; all were from the same roost. The state pathologist stated that 100s of crows have been examined over winters since 1999 and only one crow tested positive, and they were not absolutely sure about the diagnosis. Since the course of the disease in birds normally takes only a few days - this is a departure from expectations of how the disease is operating and/or is transmitted and is cause for concern. Crows are highly social animals, and considered by many to be vermin, and exterminated as such. They nest in groups and can travel good distances in seasonal migrations between overwintering sites and nesting sites. The news article stated: "Science can't even hazard a guess at what this mini-outbreak in winter means..."
What do you think could be happening: for the crows; for the virus? Provide a set of postulates, guided by evolutionary explanations. Think in terms of mutation or other genetic mechanisms, carrier and/or mode of transmission changes, behavioral changes in the host, host susceptibility; any potential mechanisms you feel make a cogent explanation from an evolutionary perspective. What might the implications be for humans?
About how long is a DN A double helix that is made up of 900 base pairs? Suppose that genes A, B, C, and D are located on the same chromosome.
What are organic compounds and what organic compounds are found in greek yogurt?
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Which of the following is NOT a trait shared between green algae and land plants?
Hypothesis: since the normal substrate for the enzymes is lactose, adding lactose along with ONPG will reduce the rate of yellow color formation.
Which of the following are secondary sex characteristics in females?
you decide that you want to figure out a situation where you see constant transcription of the lac genes but you want the amount of transcription to be low. which scenarios will give low transcription?
Hermann Kolbe's synthesis of an organic compound, acetic acid, from inorganic substances that had been prepared straight from pure elements was an important milestone for what reason.What piece of evidence contradicts this claim.
What promotes exponential growth? What constrains population development.
Can someone give me a detailed explanation of how to do this? Answer is 1:7.5 40.0 µL of solute into 0.260 mL of solvent. What is the final dilution factor.
one of the basic tenets of evolution by natural selection is that evolution requires variation upon which selection acts. How might drift prevent selection from acting?
Describe how nucleic acid hybridization studies are carried out using membrane-bound DNA. Why might one wish to vary the incubation temperature during hybridization?
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