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JAMB Biology 1993 Question 46

Question 46

Variation

Which of the following is an example of discontinuous variation observed in man?

  1. A.Skin colours
  2. B.Tongue rolling
  3. C.Body weight
  4. D.Height.
Show the answer and explanation

Answer: B (Tongue rolling)

Explanation

A person either can or cannot roll the tongue, with no in-between, so it is discontinuous. Height, weight and skin colour vary gradually.