Which of the Following Situations Provides the Best Example of 'Balanced

question 37

Multiple Choice

Which of the following situations provides the best example of 'balanced polymorphism'?

• A) Dark and light colored moths were distributed equally in industrial England.
• B) The sickle cell trait is selected for at a rate high enough to confer protection from malaria but low enough to keep death rates from sickle cell anemia in check.
• C) Lactose tolerance in some populations is balanced out by lactose intolerance in others.
• D) The hemoglobin allele that offers protection from both malaria and sickle cell anemia exists in a balance with a hemoglobin allele that offers no protection.
• E) Moth wing color alleles co-exist at rates that go up and down over time depending on which environmental pressures are more active.

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Definitions:

Every 24 Hours

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A mental health disorder characterized by excessive nervousness, fear, apprehension, and worry.

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