- A heterozygous black (bb) mouse is crossed with homozygous black mouse (bb)
- Bb means heterozygous dominant
- Bb means homozygous dominant
- If a heterozygous dominant organism is crossed homozygous dominant organism , then the offspring will have a 0% probability of having recessive trait
- Therefore, the offspring of the mice will have a 0% probability to express recessive trait

- The offspring of the mice will have a 0% probability to express recessive trait
- Brown fur is a recessive trait in mouse
- So, the offspring of the mice will have a 0% probability to be brown

So, the offspring of the mice will have a 0% probability to be brown
Question: A mouse is homozygous for black fur (BB). The other parent is heterozygous for black fur with a recessive trait for brown fur ( Bb ). If black is the dominant trait, what percentage of the offspring will be brown?
Context: - A heterozygous black (bb) mouse is crossed with homozygous black mouse (bb) 
- Bb means heterozygous dominant 
- Bb means homozygous dominant 
- If a heterozygous dominant organism is crossed homozygous dominant organism , then the offspring will have a 0% probability of having recessive trait 
- Brown fur is a recessive trait in mouse