A suppressor mutation is a mutation that counteracts the phenotypic effects of another mutation, by intra- or extragenic (intergenic) mutation. In biology mutations are changes to the Nucleotide sequence of the Genetic material of an organism A phenotype is any observable characteristic of an Organism, such as its morphology, Development, biochemical or physiological properties An Intergenic region is a stretch of DNA sequences located between clusters of Genes that contain few or no genes