Context: In a group of rats, some individuals have a normal-sized body and others have a dwarf body. In this group, the gene for the body size trait has two alleles. The allele for a normal-sized body (B) is dominant over the allele for a dwarf body (b).
Nibbles is a rat from this group. Nibbles has the homozygous genotype BB for the body size gene.
Based on this information, what is Nibbles's phenotype for the body size trait?
A. a normal-sized body
B. a dwarf body
Pick the correct answer from the listed options and provide the letter of the selected option.
Answer: A