Lactose TOLERANCE Is the Exception, Not the Norm

question 64

Multiple Choice

Lactose TOLERANCE is the exception, not the norm. This is because:

• A) All adults have the enzyme lactase, which helps us to digest milk.
• B) Fishing populations are more likely to be exposed to lactose bacterium and therefore to have evolved a tolerance for it.
• C) Where milk is taboo infants never get exposed to it, causing an intolerance later in life.
• D) Lactose tolerance only holds a selective advantage for populations with dairy herds.
• E) Lactose tolerance only holds a selective advantage for populations living near the equator.

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