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'''Expressivity''' is a term used in [[genetics]] to describe the degree to which a [[genotype]] is expressed in an individual's [[phenotype]]. It is a measure of the variation in a phenotype for a given genotype, and can be influenced by both genetic and environmental factors.

==Definition==
Expressivity in genetics refers to the degree to which a trait is expressed in an individual. It is a measure of the variation in a phenotype for a given genotype. This means that even if two individuals have the same genotype, they may not express the trait to the same degree. This variation can be due to a number of factors, including the influence of other genes and environmental factors.

==Factors Influencing Expressivity==
There are several factors that can influence the expressivity of a gene. These include:

* '''[[Genetic background]]''': The presence of other genes can influence the expressivity of a gene. This is because genes do not act in isolation, but rather interact with each other in complex ways.

* '''[[Environment]]''': Environmental factors can also influence the expressivity of a gene. This can include things like diet, exposure to toxins, and other environmental factors.

* '''[[Epigenetic factors]]''': Epigenetic factors, such as DNA methylation and histone modification, can also influence the expressivity of a gene.

==Examples==
There are many examples of variable expressivity in genetics. For example, the [[Marfan syndrome]] is caused by mutations in the FBN1 gene. However, the severity of the symptoms can vary widely among individuals with the same mutation, demonstrating variable expressivity.

Another example is [[neurofibromatosis type 1]], which is caused by mutations in the NF1 gene. This condition can cause a wide range of symptoms, from mild to severe, again demonstrating variable expressivity.

==See Also==
* [[Penetrance]]
* [[Genotype]]
* [[Phenotype]]
* [[Epigenetics]]

==References==
<references />

[[Category:Genetics]]
[[Category:Genetic terminology]]
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Expressivity (genetics) - Revision history

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