In Humans, the Allele for Red-Green Color Blindness Is X-Linked

question 44

Multiple Choice

In humans, the allele for red-green color blindness is X-linked and recessive (Xʳ; the dominant allele is called Xᴿ) . A man with normal color vision marries a color-blind woman who gives birth to a color-blind daughter. What can be inferred from this information?

• A) The woman is XᴿXʳ.
• B) The man must be a carrier for the color blindness allele.
• C) The daughter must be heterozygous.
• D) The man is probably NOT the father of the daughter.

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Definitions:

Polygraph Principle

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Spillover Effect

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James-Lange Theory

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Two-Factor Theory

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