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JAMB Biology 2012 Question 42

Question 42

Chromosomes, DNA and Sex Linkage

When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?

  1. A.25%
  2. B.50%
  3. C.75%
  4. D.100%.
Show the answer and explanation

Answer: B (50%)

Explanation

XcY × XCXc gives XCXc, XcXc, XCY and XcY. Two of the four (XcXc and XcY) are colour blind, so 50%.