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WAEC Biology 1992 Question 57

Question 57

Mendelian Inheritance

If a black guinea pig of genotype BB, is crossed with a white guinea pig of genotype bb, what will be the phenotype of the F1 generation?

  1. A.Half of the offspring would be black while the other half would by white
  2. B.All the offsprings would be black
  3. C.All the offsprings would be grey
  4. D.One-third of the offspring would be black while two-third would be white
  5. E.Two-thirds of the offspring would be black while one-third would be white
Show the answer and explanation

Answer: B (All the offsprings would be black)

Explanation

BB × bb gives only Bb, and black is dominant, so all are black.