Question

The locus for fur color is represented by b if the allele codes for brown fur and b if the allele codes for white fur. what percentage of the offspring would have brown fur if brown is dominant over white and two white mice were crossed?

Answer 1

If brown is dominant (B) and white is recessive (b), then for this cross of 2 white mice, you are crossing bb x bb ---- so the only mice you can end up with will be white! 
Answer: 0%