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JAMB Biology 2009 Question 43

Question 43

Mendelian Inheritance

A woman with the ability to roll her tongue (Tt) marries a man who cannot roll his tongue (tt). What is the probability of each of their children being a tongue roller?

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

Answer: C (50%)

Explanation

Tt × tt gives Tt, Tt, tt, tt. Half the children are Tt and can roll their tongue, so the chance is 50%.