mutant phenotype evidence The allele that encodes the phenotype most common in a particular natural population is referred to as the wild type allele, while any other form of that allele is known as the mutant form. Indeed, the GroEL protein appears to be more abundant in the LM3 wild type strain compared to the LM3-2 mutant strain, suggesting the involvement of the CcpA protein in the positive regulation of its expression. ECO:0000015 eco A type of experimental phenotypic evidence in which an observable phenotypic difference results from a change or mutation in DNA. Note that mutations need not be negative. Changes to DNA sequence (mutations) may be detrimental, have no impact, or be beneficial. experimental phenotypic evidence