Based on this information, what is Clyde's phenotype for the Tobiano patterning trait?

 - having Tobiano patterning
 - not having Tobiano patterning
Clyde's genotype for the Tobiano patterning gene is bb. Clyde's genotype of bb has only b alleles. The b allele is for not having Tobiano patterning. So, Clyde's phenotype for the Tobiano patterning trait must be not having Tobiano patterning.
To check this answer, consider whether Clyde's alleles are dominant or recessive. The allele for having Tobiano patterning (B) is dominant over the allele for not having Tobiano patterning (b). This means B is a dominant allele, and b is a recessive allele.
Clyde's genotype of bb has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, Clyde's phenotype for the Tobiano patterning trait must be not having Tobiano patterning.