They have the same genotype and phenotype. They have different phenotypes and genotypes. They have the same phenotype but different genotypes. They have the same genotype but different phenotypes.
I gave my students this multiple choice question: In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b alleles while the other only has B alleles. Which statement is true about the brothers?

Only one answer is correct among these 4 choices:
- They have the same genotype and phenotype.
- They have different phenotypes and genotypes.
- They have the same phenotype but different genotypes.
- They have the same genotype but different phenotypes.

Could you tell me which one is correct?

They have the same phenotype but different genotypes.