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Q.

Which of the given statements is not correct regarding colour blindness?

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a

It is more common in males than in females.

b

Homozygous recessive condition is required for the expression of colour blindness in females.

c

Males can be carriers of the trait.

d

Colour blind women always have a colourblind father and always produce a colour blind son.

answer is C.

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Detailed Solution

Colourblindness is due to defective gene on X chromosome. Males, who have only one X chromosome (i.e., they are hemizygous), will fully express an X-linked disorder. On the other hand, females, who have two X chromosomes, will be carriers of the defect.

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