Question

next, you perform a cross with a mouse with black fur and a mouse with white fur. which result(s) for the offspring would confirm that the mouse with black fur was heterozygous? 4 mice with black fur 8 mice with black fur, 1 mouse with white fur 5 mice with black fur, 6 mice with white fur 6 mice with black fur, 2 mice with white fur done

Explanation:

If the black - furred mouse is heterozygous (let's say Bb, where B is the allele for black fur and b is the allele for white fur) and is crossed with a white - furred mouse (bb), the expected phenotypic ratio of the offspring is 1:1 (black - furred : white - furred) according to Mendelian genetics. This is because the heterozygous black - furred mouse can pass on either the B or b allele, and the white - furred mouse can only pass on the b allele. So, any result showing a non - zero number of white - furred offspring along with black - furred offspring would suggest that the black - furred parent was heterozygous.

Answer:

B. 8 mice with black fur, 1 mouse with white fur
C. 5 mice with black fur, 6 mice with white fur
D. 6 mice with black fur, 2 mice with white fur