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JAMB Biology 2005 Question 45

Question 45

Mendelian Inheritance

A yellow maize is crossed with a white maize and the first filial generation produce yellow maize only. The white trait is said to exhibit

  1. A.dominance
  2. B.recessiveness
  3. C.codominance
  4. D.incomplete dominance
Show the answer and explanation

Answer: B (recessiveness)

Explanation

The white trait disappears in the F1 because the yellow allele masks it. A trait that is hidden in this way is recessive.