WAEC Biology 2012 Objective — Question 54
Question 54 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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Two plants with red flowers were test crossed. Which of the following results indicate that the plants are heterozygous for red flowers?
- A. If the two plants are homozygous red, all the offspring will also be redCorrect
- B. 25% white, 75% red and 50% white
- C. 100% white
- D. 100% red
Explanation
If the two plants are homozygous red, all offspring will also be red. Since the two are heterozygous for red flower colour, the ratio of red flower to white flower will be 3:1 (75% red; 25% white).
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