B BB

Bb

Field Mice

A scientist collected a population of field mice. All of

the mice collected had brown fur, which is an

autosomal dominant trait in this population. In some

of the laboratory-bred mice, a white mouse

occasionally appeared. The Punnet square shows the

cross that would produce a white mouse.

b

Bb

bb

10

9

On the Punnet square, which of

these represents the genotype of

a white mouse?

If two white mice were crossed,

what percent of their offspring

would be expected to have

white fur?

Ab

B BB

C Bb

D bb

A 100%

B 75%

C 25%

D0%