Biology · Oct / Nov 2024 · Paper 41 · Question 5

The gene for red-green colour vision is on the X chromosome. There are two alleles for this gene: • The allele for normal colour vision is represented by the letter B. • The allele for red-green colour blindness is represented by the letter b. Fig. 5.1 shows a pedigree chart for a family in which some of the members are red-green colour-blind. male with normal colour vision female with normal colour vision red-green colour-blind male red-green colour-blind female 1 2 3 4 5 6 7 9 8 10 11 12 13 14 15 Fig. 5.1

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