A) women are more resistant to disease than men
B) the male sex hormone testosterone causes the disease
C) the colour blind gene is carried on the Y chromosome
D) men are hemizygous and one defective gene is enough to make them colour blind
Correct Answer: D
Solution :
The gene for colour blindness is present on X-chromosome. If one X-chromosome of female have gene for colour blindness, this will be carrier (normal) but if a male have gene on X-chromosome, it will be colourblind (since only one X-chromnsome is present in male).
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