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In the plant Arabidoposis thaliana, a geneticist is interested in the development of trichomes (small projections) on the leaves. A large screen turns up two mutant plants (A and B) that have no trichomes, and these mutants seem to be potentially useful in studying trichome development. (If they are determined […]

Question: Kangaroo rats native to North American deserts have very efficient kidneys. They excrete an exceedingly small volume of highly-concentrated urine in order not to lose much water from their bodies. If you compare a desert kangaroo rat kidney and a human kidney you would see that the rat kidney has […]

Tay-Sachs is a recessive lethal disease in which there is neurological deterioration early in life. This disease is rare in the population overall but is found at relatively high frequency in Ashkenazi Jews from Central Europe. A woman (Mary) whose maternal uncle had the disease is trying to determine the probability that she […]

Question: Compare changes in the carbon cycle to that of the nitrogen cycle on human health. Please make a conceptual graphical model for how changing the carbon cycle is likely to impact human health. In each box, provide a citation source for each box. (If the citation is from your textbook, […]