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WAEC Biology 2003 Question 54

Question 54

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 genotypes of the parents if R is for red gene and r for white gene?

  1. A.RR x Rr
  2. B.RR x rr
  3. C.rr x rr
  4. D.Rr x Rr
Show the answer and explanation

Answer: D (Rr x Rr)

Explanation

448 : 154 is about 3 : 1. Two red parents giving some white offspring must both carry the hidden r, so both are Rr.