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JAMB Biology 1987 Question 42

Question 42

Mendelian Inheritance

If a plant, homozygous for round and yellow (RR;YY), is crossed with a wrinkled green type (rr:yy) all of the resulting seeds will be

  1. A.blue and wrinkled
  2. B.round and yellow
  3. C.wrinkled and yellow
  4. D.round and greenish-yellow.
Show the answer and explanation

Answer: B (round and yellow)

Explanation

Every offspring is RrYy. Round and yellow are dominant, so all the seeds are round and yellow.