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JAMB Biology 1999 Question 43

Question 43

Mendelian Inheritance

If the offspring of a cross between a brown mouse (bb) and a black mouse (BB) are allowed to interbreed, how many different genotypes would result?

  1. A.2
  2. B.3
  3. C.4
  4. D.5.
Show the answer and explanation

Answer: B (3)

Explanation

The first cross gives all Bb. Crossing Bb × Bb gives BB, Bb and bb, which is 3 genotypes.