White stallion: bbcc
brown mare: bbc_
if the brown mare can only have brown offspring with the white stallion, what is the genotype of the mare?

The genotype of the mare is BBCC.

Explanation-

The genotype of the white stallation is Bbcc and brown mare is BBC_. This indicates that this trait is determined by the allele C and c. White stallation (cc) is a recessive trait and brown mare is a dominant trait (allele is C). This means that even one 'C' allele in the genotype will give brown mare.

As per the question, brown mare can only have brown offspring with the white stallation.

This means that the only possible genotype of the parental brown mare  is BBCC, which produces all brown mares when crossed with the given white stallation.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

what's the question ?