Fenotip

Fenotip, or phenotype in English, refers to the observable characteristics of an organism that result from the interaction of its genetic makeup (genotype) with the environment. It encompasses physical traits such as height, morphology, and coloration; physiological traits such as metabolism and blood type; and behavioral traits. Phenotypes are shaped by gene expression, regulatory networks, developmental processes, and environmental influences, including nutrition, climate, and disease.

Phenotypes can be simple or complex. A single gene can determine a discrete trait, such as pea flower color, while most traits are polygenic and influenced by multiple genes and environmental factors. Phenotypic plasticity describes how a single genotype can produce different phenotypes under different environmental conditions.

The concept is central to genetics, breeding, and medicine. In breeding, phenotypic assessment guides selection for desirable traits, often alongside genetic information. In medicine, phenotypes are used to classify diseases, assess risk, and guide treatment, though they may be influenced by age, sex, and comorbidities. Measurements of phenotype can be direct (visible traits) or indirect (biomarkers, imaging, or metabolic profiles).

Limitations include incomplete penetrance and variable expressivity, meaning that not all individuals with a given genotype display the trait to the same extent. Additionally, environmental variation can obscure genetic effects, complicating the interpretation of phenotypes.