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WAEC Biology 2015 Question 44

Question 44

Mendelian Inheritance

Use the diagram below. Which of the following statements about the cross is correct?

Diagram for this question
  1. A.The gene for the spotted coat is recessive to the gene for the black coat
  2. B.Black coat and spotted coat are co-dominant
  3. C.The gene for the spotted coat is dominant over the gene for the black coat
  4. D.The genotype for the F1 are homozygous dominant
Show the answer and explanation

Answer: C (The gene for the spotted coat is dominant over the gene for the black coat)

Explanation

All the F1 are spotted and black reappears in the F2 (3 spotted : 1 black), so spotted is dominant and black is recessive.