The Persistence of the Sickle-Cell Anemia Allele in Some African

question 49

Multiple Choice

The persistence of the sickle-cell anemia allele in some African populations is the result of ____.

• A) ​a high rate of mutation of the normal allele to the sickle-cell anemia allele
• B) ​the advantage of the heterozygous form over the homozygous forms
• C) ​nonrandom mating
• D) ​a decline in the occurrence of malaria in Africa
• E) ​genetic drift

Identify the divisions and functionalities of bronchi in lung supply.

Recognize components of the respiratory zone and their roles in gas exchange.

Understand why aspiration is more common into the right lung.

Understand the mechanisms regulating the airflow and its regulation through bronchioles.

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Definitions:

I. M. Pei

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