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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?
Assume that the D and M genes are on the same chromosome, but they are separated by one hundred map units. You make the following cross: DM / dm x dm / dm.
Why may selfing be selected for in nature yet still be an ‘evolutionary dead end'. How many kilocalories must Janine eat each day to maintain her present body weight.
Action potentials are usually generated at axon hillock and propagated down axon away from the cell body. If you experimentally depolarized an axon to the threshold level at a point halfway down the axon, what would happen.
If the gene encoding the enzyme, glycerophosphate acyl tranferase is mutated, how does this affect phospholipid metabolism?
define a well-controlled experiment to determine if the rise in internal free calcium observed in the cytoplasm of unfertilized sea urchin eggs in the presence of A23187 is due to in flux of calcium from seawater. Include experimental treatments, ..
He was puzzled, combative, and he refuses to drink any water or any liquid. He lived on Oct. 7th, 1849. While said to the man's name, the student thought "Nevermore!" What was his diagnosis.
Explain how each of these factors will affect the melting temperature of DNA.
You measured the purified protein concentration, which is 5 ug/uL. You decided to load 20 ug protein to the gel. How would you dilute your sample?
in what way or ways could you adjust incubation temperature to grow an organism at less than its optimal growth rate?
Explain, in a sequential fashion, the steps involved in the initiation and propagation of an action potential including all neurotransmitters and ions involved in the process.
What fraction of offspring of the cross AabbDd x AaBbdd are expected to have the same phenotype as either one of their parents assume that all three genes are on different chromosomes.
Explain two ways in which a change in a DNA molecule could lead to the emergence of a constitutive mutant. How could these two types of constitutive mutants be distinguished genetically.
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