Which Situation Is an Example of Modifier Gene Action

question 18

Multiple Choice

Which situation is an example of modifier gene action?

• A)A mother and father both have type O blood, and their son is born with type B blood.
• B)Two children in the same family both have sickle cell disease, but one child has more severe symptoms than the other.
• C)Monozygotic twins separated at birth and raised in two different countries are of different heights (3 inches) and different weights (25 pounds).
• D)A woman who has a gene mutation for diabetes mellitus type 2 delays the onset of the disease by exercising and maintaining a normal weight.

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Definitions:

Intrinsically Motivated

Being driven by internal rewards, such as personal satisfaction or joy, rather than external incentives.

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An unauthorized imitation of something genuine, with the intention to deceive or defraud.

Organic

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Urban Legend

A fictional story, often rooted in modern folklore, which is widely believed and circulated as true.