observable physical and/or biochemical characteristics of the expression
of a gene; the clinical presentation of an individual with a particular genotype
Definition from: GeneReviews
from the University of Washington and the National Center for Biotechnology Information
- A phenotype is an individual's observable traits, such as height, eye color, and blood type. The genetic contribution to the phenotype is called the genotype. Some traits are largely determined by the genotype, while other traits are largely determined by environmental factors.
Definition from: Talking Glossary of Genetic Terms from the National Human Genome Research Institute
Related discussion in the Handbook
See also Understanding Medical Terminology.