- The appearance of an individual, which results from the interaction of the person’s genetic makeup and his or her environment. By contrast, the genotype is merely the genetic constitution (genome) of an individual. For example, if a child's genotype includes the gene for osteogenesis imperfecta (brittle bone disease), minimal trauma can cause fractures. The gene is the genotype, and the brittle bones themselves are the phenotype.
* * *The observable characteristics, at the physical, morphologic, or biochemical level, of an individual, as determined by the genotype and environment. [G. phaino, to display, + typos, model]
* * *phe·no·type 'fē-nə-.tīp n the observable properties of an organism that are produced by the interaction of the genotype and the environment compare GENOTYPE (2)phe·no·typ·ic .fē-nə-'tip-ik also phe·no·typ·i·cal -i-kəl adjphe·no·typ·i·cal·ly -i-k(ə-)lē adv
* * *n.1. the observable characteristics of an individual, which result from interaction between the genes he possesses (genotype) and the environment.2. the expression in a person or on a cell of characteristics determined by genes that are not fully defined.
* * *phe·no·type (feґno-tīp) [pheno- (def. 1) + type] the observable morphological, biochemical, and physiological characteristics of an individual, either in whole or with respect to a single or a few traits, as determined by a combination of the genotype and the environment.
Medical dictionary. 2011.