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Epistasis

OCR A-level BiologyGenetics and VariationLesson 28 of 36

Epistasis is the interaction of different genes at different loci. Some epistatic genes are regulatory genes. Other genes code for enzymes on the same biochemical pathway. Continuous variation is the result of the interaction of many genes many of which exhibit epistasis.

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Key terms in this lesson

Allele
One of the different forms of a gene, arising from mutation, that occupies the same locus on homologous chromosomes.

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