Phenotype
![The shells of individuals within the bivalve mollusk species Donax variabilis show diverse coloration and patterning in their phenotypes](/Images/godic/202502/02/Coquina_variation32544.jpg")
![Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal colour in pea. The letters B and b represent genes for colour and the pictures show the resultant flowers.](/Images/godic/202502/02/Punnett_square_mendel_flowers.svg2544.png")
![Biston betularia morpha typica, the standard light-colored Peppered Moth.](/Images/godic/202502/02/Biston.betularia.72002544.jpg")
![Biston betularia morpha carbonaria, the melanic Peppered Moth, illustrating discontinuous variation.](/Images/godic/202502/02/Biston.betularia.f.carbonaria.72092544.jpg")
A phenotype (fromGreek phainein, meaning "to show",and typos, meaning "type") is the composite of an organism's observable characteristics or traits, such as its morphology, development, biochemical or physiological properties, phenology, behavior, and products of behavior (such as a bird's nest). A phenotype results from the expression of an organism's genes as well as the influence of environmental factors and the interactions between the two. When two or more clearly different phenotypes exist in the same population of a species, the species is called polymorph.