Biology
JAMB 2002
If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be
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A.
have normal vision
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B.
be colour-blind
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C.
be totally blind
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D.
be a carrier of colour blindness
Correct Answer: Option D
Explanation
The boy is a carrier because Xn the recessive allele for colour blindness
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