Does the environment exert an influence on the phenotype?

A phenotype may be changed (compared to the original situation conditioned by its genotype) by nongenetic means. Examples: some hormones might be cease to be secreted due to diseases but the genes that verify their secretion remain intact; a person can go to a hairdresser and change the color of his/her hair; plastic surgery can be performed to alter facial features of an individual; colored contact lenses may be worn; a plant can grow beyond its genetically conditioned size by application of phytohormones.