Final answer:
The set of phenotypes expressed by a single genotype across a range of environmental conditions is referred to as the norm of phenotype.
Step-by-step explanation:
The set of phenotypes expressed by a single genotype across a range of environmental conditions is referred to as the norm of phenotype. Phenotype is the observable characteristics or traits of an organism, such as color and structural morphology. It is influenced by both the genetic makeup (genotype) of the organism and the environmental conditions.