Genetics questions for Biology?

[Justin S]

In mice black coat color is dominant to white coat color. In order to determine the genotype of a black-coated male a scientist should..
a. cross the male with any black female
b. cross the male with a homozygous black female
c. cross the male with a homozygous white female
d. determine the phenotype of the mouse

 

[Peter S]

c. cross the male with a homozygous white female.
A test cross.

If BB, when x bb gives all Bb (black).
If Bb, when x bb gives 50% Bb and 50% bb.

 

[jalepenostick55]

when i doubt, pick 3 (or c)