Question 5

In a cross between black furred rabbit (B) and white furred rabbit (b), all offspring were found to have black fur. What can be inferred about the genetic makeup of the parent rabbits?
(A) BB X bb
(B) Bb X Bb
(C) Bb X bb
(D) bb X bb

Answer:

(A) BB × bb

Explanation:
When a homozygous dominant parent (BB) is crossed with a homozygous recessive parent (bb), all F₁ offspring are heterozygous (Bb) and show the dominant trait (black fur).