What does phenotype mean?
A phenotype is the observable form of a living thing: its size, colour, shape, behaviour, and other traits that can be seen or measured. It results from the interaction between an organism's genotype, or inherited genetic makeup, and environmental influences such as diet, climate, and disease. This distinction explains why two people with similar genes may have different phenotypes, and why the same genetic variant can produce different effects in different environments. Scientists compare phenotypes to identify genetic patterns, classify organisms, study disease, and understand evolutionary change. The term is also used more broadly, sometimes metaphorically, to describe the characteristic way something appears or develops. In ordinary conversation, genotype and phenotype are often contrasted: genotype refers to the underlying genetic information, while phenotype refers to the traits through which that information becomes visible. The related adjective is phenotypic, meaning “relating to or consisting of a phenotype.”
nounThe observable characteristics of an organism or other biological entity, including traits such as form, colour, and behaviour, that result from the interaction of its genotype with its environment. The term can also refer more generally to a characteristic expression or outwardly observable form.
- The observable characteristics of an organism or other biological entity, especially those used to distinguish it from others.
- A characteristic, outwardly observable form or expression; in broader usage, the way a particular condition, trait, or influence manifests itself.
"The mutation changed the fly's phenotype by producing lighter-coloured wings."
"Researchers compared the phenotypes of plants grown in dry and wet conditions."
"Rising inequality has become a prominent phenotype of the city's economic development."
"The phenotype of the bacteria changed after it was exposed to the antibiotic."
The plural is used for distinct observable trait patterns, organisms or populations displaying them, or different forms of a condition or characteristic expression.
"The study identified several distinct phenotypes associated with the genetic variant."
Your phenotype is the visible meeting point between your genes and the world around you.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does phenotype come from?
Phenotype was formed in the early 20th century from Greek phainein, meaning “to show” or “appear,” and typos, meaning “model” or “pattern.” The word was introduced alongside genotype to distinguish an organism's inherited genetic constitution from its observable characteristics. Its formation reflects the growing scientific practice of describing biological traits in systematic terms.
Related word forms
How phenotype is actually used
In biology and medicine, phenotype is a formal technical term associated with genetics, evolution, and biomedical research. In general writing, it is occasionally used metaphorically for a characteristic form or manifestation, but such usage may sound specialised or deliberately abstract.
Easily confused with phenotype
A genotype is an organism's underlying genetic makeup, whereas a phenotype is the set of characteristics that becomes observable through the interaction of genes and environment.