Question

The Punnett Square shows a cross between a mouse with black fur whose genetic makeup was BB, and a mouse with white fur whose genetic makeup was bb.
Explain why all of the offspring have black fur, even though each of them has a gene for white fur?

Answer 1

Answer:

There must have two white genes to become white.

Explanation:

In order to a mouse to have white fur, both of their genes must be white. In the punnet square, you have a Black (BB) and a white (bb). If they have offspring, all of them have one black (Dominant) and one white (recessive). The black gene overpowers the white gene, so they come out black.

Answer 2

White is recessive so there must be 2 white mice to great a white mouse