If XN is the dominant allele for normal vision and Xn the...
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
have normal vision
be colour-blind
be totally blind
be a carrier of colour blindness
Correct answer is D
The boy is a carrier because Xn is the recessive allele for colour blindness.
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