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Question
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.
(a) Describe these phenotypes.
(b) Explain why red-green colour blindness is more likely to occur in men than in women. [4 MARKS]
(a) Describe these phenotypes.
(b) Explain why red-green colour blindness is more likely to occur in men than in women. [4 MARKS]
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Solution
a) 3 Marks
b) 1 Mark
(a)
(i) Female, normal vision
(ii) Male, red-green colour blind
(iii) Male, normal vision
(b) In males, only one allele from a pair is present. So if recessive factor b is present, it will show as red-green colour blindness.
b) 1 Mark
(a)
(i) Female, normal vision
(ii) Male, red-green colour blind
(iii) Male, normal vision
(b) In males, only one allele from a pair is present. So if recessive factor b is present, it will show as red-green colour blindness.
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