What is the definition of phenotype?

The definition of phenotype refers to the observable physical traits and characteristics of an organism that are influenced by both genetic factors and environmental conditions. This includes features like height, eye color, and susceptibility to certain diseases, which can all vary between individuals due to the interplay of their genetic makeup and the environments in which they develop and live.

This understanding of phenotype contrasts with the concept of genotype, which specifically describes the genetic makeup of an organism. The emphasis on the combination of genetics and environment in shaping phenotype is crucial, as it highlights that traits can be modified by external factors, contributing to the diversity seen among individuals of the same species. This broader perspective encompasses physical, behavioral, and physiological traits, making it a key concept in the field of biology and psychology, where the interaction between biology and environment is a central theme.