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WAEC Biology 2021 Question 46

Question 46

Mendelian Inheritance

In humans, pointed eyebrows (B) is a dominant trait over smooth eyebrows (b). A student and the mother have smooth eyebrows while the father has pointed eyebrows. What is the genotype of the father?

  1. A.BB
  2. B.Bb
  3. C.bb
  4. D.BBbb
Show the answer and explanation

Answer: B (Bb)

Explanation

The student is bb, getting one b from each parent. The father shows the dominant trait but must also carry b, so he is Bb.