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WAEC Biology 2004 Question 53

Question 53

Mendelian Inheritance

What will be the genotypic ratio when two heterozygous red pea plants are crossed?

  1. A.1:0
  2. B.1:2:1
  3. C.2:1
  4. D.3:1
Show the answer and explanation

Answer: B (1:2:1)

Explanation

Rr × Rr gives RR, Rr, Rr and rr, a genotypic ratio of 1 : 2 : 1 (the phenotypic ratio is 3 : 1).