The relationship between an organism's genotype and phenotype is fundamental in the field of genetics. The genotype refers to the genetic makeup of an organism, encompassing the specific alleles inherited from parents. In contrast, the phenotype is the observable expression of these genes, influenced by both genetic and environmental factors. This relationship can vary significantly; for example, identical genotypes under different environmental conditions may exhibit diverse phenotypic traits. Understanding this interaction is crucial for studying inheritance patterns, evolution, and natural selection within populations.