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Wikipedia:Picture of the day/January 13, 2007

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Individuals in the mollusk species Donax variabilis show diverse coloration and patterning in their phenotypes. The phenotype of an individual organism is either its total physical appearance and constitution or a specific manifestation of a trait, such as size, eye color, or behavior that varies between individuals. Phenotype is determined to a large extent by genotype and influenced by environmental factors. Early geneticists were able to trace inheritance patterns without any knowledge of molecular biology.Photo credit: Debivort