What is epistasis?
Epistasis is when the allele of one gene affects the expression of another gene in the phenotype.
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What is a epistatic gene?
An epistatic gene is one that affects the expression of another gene.
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What is recessive epistasis?
Recessive epistasis occurs when two recessive alleles affect the expression of another gene.
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What is dominant epistasis?
Dominant epistasis occurs when one or two dominant alleles can affect the expression of another gene.
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How does epistasis affect biochemical pathways?
If a gene in a pathway is prevented from being expressed by epistasis, subsequent reactions are blocked, masking other genes.
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If gene 1 produces blue pigment when a dominant allele B is in the genotype, and gene 2 makes the blue pigment green when a dominant allele G is in the genotype, what would the phenotype be if the genotype was bbGG?
The genotype bb means no blue pigment is made, which would mask the second gene.
No pigment would be produced at all and it doesn't matter whether the genotype for the second gene is GG, Gg, or gg.
Gene 1 is epistatic to gene 2, as it can mask its expression.
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