Question

The Duffy antigen is found in most individuals from Western Africa. It provides some resistance to malaria. Which of these processes would explain why this trait can now be found in many of the white, European populations?
A) gene flow
B) genetic drift
C) natural selection
D) allele reorganization
Which physical factors MOST influence the Antarctic ecosystem?
A) climate, rain, erosion
B) plants, wind, and air pressure
C) weather, ice, and ocean currents
D) salinity of water, polar bear population, and snow

Answer 1

Here are the answers to the given questions above. 
1. Since the Duffy antigen can be found in most individuals residing in Western Africa and that recently, this can be already found in many white European populations, the process the explains this is what we call gene flow. The answer is option A.
2. The physical factors that are considered mostly influences the Antarctic ecosystem are weather, ice, and ocean currents. The answer would be option C. Hope this helps.

Answer 2

Ans.

The Duffy antigen is present in most of the West Africans. It is responsible for resistance in those individuals for malaria. The Duffy antigen trait is transferred into European population from African population as it is beneficial for the populations since it provides resistance against malaria, because of the process of gene flow. Gene flow involves transfer of genetic variations from one to another population.

Thus, the correct answer is 'option A). gene flow.'

Ans.

The Antarctic ecosystem shows the driest, highest, windiest, and coldest ecosystem in the world. The major abiotic (non-living) or physical factors, which influence the ecosystem of Antarctica includes ocean winds, snow, and climatic conditions or weather. Thus, the correct answer is 'option C). weather, ice, and ocean currents.'