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WAEC Agricultural Science 2007 Question 37

Question 37

Basic Genetics

Assuming that in sheep, the allele for black coat colour is dominant over that for brown coat colour. What percentage of the F1 generation will have black colour when two heterozygotes are crossed?

  1. A.100%
  2. B.75%
  3. C.50%
  4. D.25%
Show the answer and explanation

Answer: B (75%)

Explanation

Bb × Bb gives 3 black : 1 brown, so 75% black.