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Medullary thyroid cancer
Medullary thyroid cancer

File - Mrs. Badger`s Honors Biology Class
File - Mrs. Badger`s Honors Biology Class

... 6. third phenotype that has both homozygous parental phenotypes 7. blood type (A, B, AB) Polygenic traits: traits produced by two or more genes; show continuous ranges of phenotypes; examples include height, eye color, skin color. Epistasis: one gene affects the expression of other genes involved in ...
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Epistasis



Epistasis is a phenomenon that consists of the effect of one gene being dependent on the presence of one or more 'modifier genes' (genetic background). Similarly, epistatic mutations have different effects in combination than individually. It was originally a concept from genetics but is now used in biochemistry, population genetics, computational biology and evolutionary biology. It arises due to interactions, either between genes, or within them leading to non-additive effects. Epistasis has a large influence on the shape of evolutionary landscapes which leads to profound consequences for evolution and evolvability of traits.
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