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JAMB Biology 2005 Question 44

Question 44

Mendelian Inheritance

Which of the following is the best explanation for a child who is phenotypically short and born of two tall parents?

  1. A.The father possesses a gene for shortness
  2. B.The mother possesses a gene for shortness
  3. C.Nature makes the child short
  4. D.Both parents possess genes for shortness
Show the answer and explanation

Answer: D (Both parents possess genes for shortness)

Explanation

Shortness here is recessive, so the child must have two short alleles (tt). Each parent must be Tt, carrying one gene for shortness.