Question 56
Mendelian InheritanceIn a case of complete dominance, what is the phenotypic ratio of the cross Bb X Bb; where B = black and b = white?
- A.1 black : 1 grey : 2 whites
- B.1 black : 3 whites
- C.1 black : 2 blues : 1 white
- D.3 blacks : 1 white
Show the answer and explanation
Answer: D (3 blacks : 1 white)
Explanation
Bb × Bb gives BB, Bb, Bb, bb; with complete dominance the first three are black, so 3 black : 1 white.