What is a phenotype?

A phenotype is the observable physical or biochemical characteristics of an organism, resulting from the interaction of its genotype (genetic makeup) with the environment. Phenotypes can include traits such as height, eye color, and behavior.

A phenotype is the observable characteristics of an organism, such as its morphology, development, biochemical or physiological properties, phenology, behavior, and products of behavior. Phenotypes result from the interaction of an organism's genotype with the environment. Phenotype is often contrasted with genotype, which refers to the genetic makeup of an organism.