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

question 18

Multiple Choice

Red-green color blindness is a sex-linked recessive trait in humans.The normal,dominant allele is symbolized with X^N,and the recessive allele is symbolized with Xⁿ.Two people with normal color vision have a color-blind son.What are the genotypes of these parents?

• A)X^NXⁿ and XⁿY
• B)XⁿXⁿ and X^NY
• C)X^NX^N and XⁿY
• D)X^NX^N and X^NY
• E)X^NXⁿ and X^NY

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