JAMB Biology 2009 Objective — Question 43
Question 43 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2009 Objective paper, with the correct answer and a full explanation.
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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?
- A. 100%
- B. 75%
- C. 50%Correct
- D. 25%
Explanation
Tt x tt cross gives 1Tt:1Tt:1tt:1tt, i.e. 2 heterozygous tongue rollers and 2 non-rollers out of 4, giving a 50% probability of each child being a tongue roller.
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