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

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
A have normal vision
B be colour-blind
C be totally blind
D be a carrier of colour blindness

Answer is B

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