7. B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
a. they have same phenotype and genotype
b. they have different genotypes and phenotypes
c. they have same phenotype but different genotypes
d. they have same genotype but different phenotypes

The truth about these two brothers that have brown eyes is they have the same phenotype (Brown) but different genotypes (BB and Bb). So, the correct option is C.

What do you mean by Genotypes?

Genotypes may be defined as a given set of alleles that an individual possesses. They are ultimate combinations of alleles.

In this situation, the allele B is dominant over the allele b, therefore, in both cases, phenotypes remain the same i.e. Brown eyes, but the genotypes differ. This defines how an allele interacts with another allele and changes the genotype.

Therefore, the truth about these two brothers that have brown eyes is they have the same phenotype (Brown) but different genotypes (BB and Bb).

To learn more about Gene interaction, refer to the link:

https://brainly.com/question/25217589