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WAEC Biology 2026 Question 47

Question 47

Variation

Which of the following factors is responsible for phenotypic variation in organisms? I - Genetic factors; II - Environmental factors; III - A-B-O blood group system

  1. A.I only
  2. B.II only
  3. C.I and II only
  4. D.I, II and III
Show the answer and explanation

Answer: C (I and II only)

Explanation

Phenotype results from genes acting together with the environment. The ABO blood group system is itself a trait, not a cause of variation.