The Example of Extended Lactose Tolerance in Humans Tell Us

question 25

Multiple Choice

The example of extended lactose tolerance in humans tell us that

• A)it is entirely under genetic control, and researchers agree that the environment plays no role in its development.
• B)it is one of many aspects of human biology governed by both genes and by phenotypical adaptation to environmental conditions.
• C)the production of the enzyme lactase and the ability to tolerate milk remain the same among all human populations.
• D)studies indicate that people cannot increase their lactose tolerance, thereby discounting the theory of phenotypical adaptation.
• E)a simple genetic trait accounts for the ability to digest milk.

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