Help me in Biology please?

well you can have BB that's a dominant brown eyed person, if you have Bb that's stil a brown eyed person but he/she is heterozygous brwon eyed person(that just means there is a dominant and a recessive allele). a person with blue eyes always has bb because you have to have both recesive alleles to show that trait. And you can want the genotypes you have to specify if it is TT or Tt