Multiple choice

Why are men more prone to colour blindness than women?

  1. The colour blindness is an X-linked dominant trait.

  2. The gene for colour blindness is located on the Y chromosome.

  3. Women lacks Y chromosomes

  4. The colour blindness is an X-linked recessive trait.
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A Correct answer
Explanation

Since colour blindness is a recessive trait, men, who have only 1 copy of the X chromosome, will always be color blind if they inherit the defective gene. Women must inherit two defective copies in order to be color blind.

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