WAEC Biology 2012 Objective — Question 56
Question 56 of 60 from the West African Examinations Council (WAEC) Biology 2012 Objective paper, with the correct answer and a full explanation.
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In a case of complete dominance, what is the phenotype ratio of the cross Bb (where B=black and b=white) x Bb?
- A. 1 black : 1 grey : 2 white
- B. 1 black : 3 white
- C. 1 black : 2 blues : 1 white
- D. 3 black : 1 whiteCorrect
Explanation
Bb x Bb will be black since black colour is dominant over white colour. 3 out of every 4 will be black while the remaining one will be white.
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