Red-Green Colour Blindness Is a Sex-Linked Recessive Trait in Humans

question 29

Multiple Choice

Red-green colour blindness is a sex-linked recessive trait in humans. Two people with normal colour vision have a colour-blind son. What are the genotypes of the parents?

• A) XnXn and XnY
• B) XNXN and XnY
• C) XNXN and XNY
• D) XNXn and XNY

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