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(c) Colour blindness is a sex-linked characteristic The gene for colour vision is on the X chromosome. There are two alleles of this gene: • B is the allele for normal colour vision b is the allele for colour blindness. Fig. 3.2 is a pedigree chart showing the inheritance of colour blindness in a family. The key shows the sex chromosomes and the alleles of the gene for colour vision. O 00 nooo Key male with normal colour vision XY colour-blind male XbY female with normal colour vision XBXB carrier female with normal x x colour vision colour-blind female XbXb Fig. 3.2 Describe evidence from reg. 3.2 that shows that colour blindness is a sex-linked characteristic.

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Red-green colour blindness is a sex-linked inherited characteristic. The gene (allele) b for colour blindness is recessive to the gene B for normal vision. The gene b is carried only on the X chromosome.
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