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Anopheles Mosquitoes, Which Carry the Malaria Parasite, Cannot Live Above

Question 16

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Anopheles mosquitoes, which carry the malaria parasite, cannot live above elevations of 1,800 metres. In addition, oxygen availability decreases with higher altitude. Consider a hypothetical human population that is adapted to life on the slopes of Mt. Kilimanjaro in Tanzania, a country in equatorial Africa. Mt. Kilimanjaro's base is about 800 metres above sea level and its peak is 5,895 metres above sea level. If the incidence of the sickle-cell allele in the population is plotted against altitude (metres above sea level) , which of the following distributions is most likely, assuming little migration of people up or down the mountain?


A)
Anopheles mosquitoes, which carry the malaria parasite, cannot live above elevations of 1,800 metres. In addition, oxygen availability decreases with higher altitude. Consider a hypothetical human population that is adapted to life on the slopes of Mt. Kilimanjaro in Tanzania, a country in equatorial Africa. Mt. Kilimanjaro's base is about 800 metres above sea level and its peak is 5,895 metres above sea level. If the incidence of the sickle-cell allele in the population is plotted against altitude (metres above sea level) , which of the following distributions is most likely, assuming little migration of people up or down the mountain? A)    B)    C)    D)
B)
Anopheles mosquitoes, which carry the malaria parasite, cannot live above elevations of 1,800 metres. In addition, oxygen availability decreases with higher altitude. Consider a hypothetical human population that is adapted to life on the slopes of Mt. Kilimanjaro in Tanzania, a country in equatorial Africa. Mt. Kilimanjaro's base is about 800 metres above sea level and its peak is 5,895 metres above sea level. If the incidence of the sickle-cell allele in the population is plotted against altitude (metres above sea level) , which of the following distributions is most likely, assuming little migration of people up or down the mountain? A)    B)    C)    D)
C)
Anopheles mosquitoes, which carry the malaria parasite, cannot live above elevations of 1,800 metres. In addition, oxygen availability decreases with higher altitude. Consider a hypothetical human population that is adapted to life on the slopes of Mt. Kilimanjaro in Tanzania, a country in equatorial Africa. Mt. Kilimanjaro's base is about 800 metres above sea level and its peak is 5,895 metres above sea level. If the incidence of the sickle-cell allele in the population is plotted against altitude (metres above sea level) , which of the following distributions is most likely, assuming little migration of people up or down the mountain? A)    B)    C)    D)
D)
Anopheles mosquitoes, which carry the malaria parasite, cannot live above elevations of 1,800 metres. In addition, oxygen availability decreases with higher altitude. Consider a hypothetical human population that is adapted to life on the slopes of Mt. Kilimanjaro in Tanzania, a country in equatorial Africa. Mt. Kilimanjaro's base is about 800 metres above sea level and its peak is 5,895 metres above sea level. If the incidence of the sickle-cell allele in the population is plotted against altitude (metres above sea level) , which of the following distributions is most likely, assuming little migration of people up or down the mountain? A)    B)    C)    D)

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