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Example of Pleiotropy

A very broad biological term describing the effect of a gene or alteration of a gene on a phenotype. Usage is created by the context, which can be complex. Some genes have a multiple range of effects across a range of traits and characteristics of organisms. If the subject gene alters, it will have a multiple range of effects on the organism, hence the descriptor operates as defining a type of condition.

Examples of Pleiotropy:

Phenylketonuria: Multiple effects on the subject including reactions to phenylalanine, hair loss, in some cases skin pigmentation.
Arachnodactyly: Causes long fingers and other physical effects.

http://en.wikipedia.org/wiki/Pleiotropy
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-P/pleiotropy.html

Image Example of Pleiotropy:

Genome.