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WAEC Biology 2003 Question 55

Question 55

Mendelian Inheritance

Use the following information: In an experiment, a red-flowered plant was crossed with another red-flowered plant and the following results were obtained: 448 red flowers and 154 white flowers in the F1 generation.
Which of the following represents the phenotypic ratio of the above genetic cross?

  1. A.1:2:1
  2. B.4:1
  3. C.3:1
  4. D.2:2
Show the answer and explanation

Answer: C (3:1)

Explanation

448 ÷ 154 ≈ 2.9, so the ratio of red to white is about 3 : 1.