Phenotype depends on the alleles that are present, their dominance relationships, and sometimes also interactions with the environment and other factors. If you cannot tell which allele is mutant, nam...Phenotype depends on the alleles that are present, their dominance relationships, and sometimes also interactions with the environment and other factors. If you cannot tell which allele is mutant, name the gene after the recessive allele Capitalize the first letter for the dominant allele; use lower-case for the recessive allele If genes are linked, write the gene symbols together on each side of the slash.