Biology
Biology, 21.07.2019 07:00, keke6361

In a small group of people living in a remote area, there is a high incidence of "blue-skin", a condition that results from a variation within the structure of the protein hemoglobin. all of the "blue-skinned" residents can trace their ancestry to one couple, who were among the original settlers of this region. the unusually high frequency of "blue-skin" in the area is an example of

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History, 27.06.2019 22:10, diven8765
Why didn't the tunguska event in siberia in 1908 cause any deaths? it was an airburst that flattened trees over a huge area but it occurred in a remote area of the world. it was a comet that passed near the earth but it was visible to people for 18 months. it was a meteorite that created one of the largest impact craters ever recorded on earth but it occurred in a remote area of the world. it was a small diamond-bearing meteorite that was incapable of producing much damage. it was a meteor that vaporized high in the earth's atmosphere but it was visible to millions of people for several minutes. next
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Mathematics, 22.08.2019 00:30, cravens511peeelg
Suppose we fit a regression line to predict the number of incidents of skin cancer per 1,000 people from the number of sunny days in a year. for a particular year, we predict the incidence of skin cancer to be 1.5 per 1,000 people, and the residual for this year is 0.5. did we over or under estimate the incidence of skin cancer? explain your reasoning.
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Biology, 08.10.2019 21:10, tahtahtw4887
Human populations in low-uv environments tend to have lighter skin tones. one explanation is that the selective pressure for dark skin decreases as uv intensity decreases. at the same time, there is selection for lighter skin to absorb more uv radiation, which is needed for vitamin d production. what evidence supports the vitamin d hypothesis for the evolution of lighter skin tones? a. in general, people with lighter skin tend to be at higher risk of vitamin d deficiency.b. red hair and light skin are typical of people of northern european descent.c. some indigenous peoples living at high latitudes have darker skin, but they tend to eat foods rich in vitamin d.d. people with lighter skin cannot synthesize enough vitamin d in high-uv environments, such as equatorial africa.
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Biology, 18.10.2019 03:30, QueenNerdy889
The fugate family, also known as the "blue people of kentucky" have a condition known as methemoglobinemia which prevents hemoglobin from carrying oxygen and makes it difficult for unaffected hemoglobin to release oxygen to body tissues. this condition can be caused by exposure to drugs and chemicals, but can also be inherited, as with the fugates. it causes their skin to be blue and their blood is brownish, due to a lack of oxygen, and is likely to be due to the absence of an enzyme. martin fugate came to kentucky in 1820 and was reported to have been blue. he married elizabeth smith, with a normal complexion, although members of her family and other families in the region were blue. gene flow or migration is the transfer of alleles or genes from one population to another. select the combination of facts that indicate the occurrence of gene flow in the fugate family. i. four of the fugate's seven children had blue complexions. ii. travel in and out of this area was rare in the 1800's, but is more common now. iii. according to doctors, occurrence of the condition is rarely seen anymore. iv. methemoglobinemia at 10-20 percent of hemoglobin can cause blue skin without more serious symptoms. a) i. and iv. b) i. and iii. c) iii. and iv. d) ii. and iii.
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