Based on this information, what is Babel's phenotype for the body feather color trait?

 - green body feathers
 - blue body feathers
Babel's genotype for the body feather color gene is BB. Babel's genotype of BB has only B allelles. The B allele is for green body feathers. So, Babel's phenotype for the body feather color trait must be green body feathers.
To check this answer, consider whether Babel's alleles are dominant or recessive. The allele for green body feathers (B) is dominant over the allele for blue body feathers (b). This means B is a dominant allele, and b is a recessive allele.
Babel's genotype of BB has two dominant alleles. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Babel's phenotype for the body feather color trait must be green body feathers.