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?
The correct option is (A). When a black rabbit (BB) is crossed with a white rabbit (bb), all offspring (Bb) have black fur. This shows that black colour is dominant over white, making the cross BB × bb.
Science important questions Final Exam 2025 Class 10
Science Question Paper class 10
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In the given cross, a black-furred rabbit (B) is dominant, and a white-furred rabbit (b) is recessive. When a pure black rabbit (BB) is crossed with a pure white rabbit (bb), the F₁ generation gets the genotype Bb. All offspring appear black since the dominant gene masks the recessive one. Hence, the correct parental cross is BB × bb, producing all black (Bb) rabbits in the F₁ generation due to dominance of the black fur gene. The correct option is (A).