Science
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?
options
- BB X bb
- Bb X Bb
- Bb X bb
- bb X bb
Genetics
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Answer
BB X bb
Reason — In rabbits, the gene for black fur (B) is dominant, while the gene for white fur (b) is recessive because when a homozygous black-furred rabbit (BB) is crossed with a homozygous white-furred rabbit (bb), all the offspring receive one dominant allele (B) from the black parent and one recessive allele (b) from the white parent.
As a result, all offspring have the genotype Bb, which expresses the dominant black fur trait.
Thus, since all the offspring are black-furred, it indicates that the black parent was homozygous dominant (BB) and the white parent was homozygous recessive (bb).
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