Based on this information, what is Dasher's phenotype for the coat color trait?

 - a black coat
 - a red coat
Dasher's genotype for the coat color gene is ll. Dasher's genotype of ll has only l alleles. The l allele is for a red coat. So, Dasher's phenotype for the coat color trait must be a red coat.
To check this answer, consider whether Dasher's alleles are dominant or recessive. The allele for a black coat (L) is dominant over the allele for a red coat (l). This means L is a dominant allele, and l is a recessive allele.
Dasher's genotype of ll has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, Dasher's phenotype for the coat color trait must be a red coat.