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WAEC Agricultural Science 2018 Question 25

Question 25

Basic Genetics

Assuming that brown colour is dominant over black colour in cowpea. What percentage of the F1 generation will have brown colour, if a homozygous brown cowpea is crossed with a homozygous black cowpea?

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

Answer: A (100%)

Explanation

BB × bb gives all Bb, which are brown, so 100%.