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From SNPedia

Phenotype is the expression of a genotype, modified by environmental factors. There are also definitions suggesting a phenotype is the entire physical expression of an organism, or that phenotype must be outwardly visible and apparent, but in general it is used to refer to specific set of traits of interest which may or may not be outwardly apparent. Frequently it is also used to refer to different possible expressions of the same traits, somewhat analogus to a genotype. Thus, for example, the outward appearance of hair and even future baldness may be example of a phenotype, while its color, thickness, curliness and male pattern baldness are examples of traits.