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JAMB Biology 1992 Question 42

Question 42

Mendelian Inheritance

If R and r, denote the genes for a character, the offsprings of the cross between RR and Rr are

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

Answer: C (2RR, 2Rr)

Explanation

RR gives only R gametes; Rr gives R and r. The combinations are RR, RR, Rr, Rr, i.e. 2RR : 2Rr.