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HomeHomework HelpgeneticsEpistasis and Gene Interactions

Epistasis and Gene Interactions

Epistasis is a genetic interaction where the effect of one gene is modified or suppressed by one or more other genes, influencing the expression of a particular phenotype. This interaction can result in the masking of the phenotypic effects of alleles at one locus by alleles at another locus.

intermediate
2 hours
Genetics
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Overview

Epistasis is a fascinating aspect of genetics that reveals how genes can interact in complex ways. It plays a crucial role in determining phenotypes, as one gene can mask or modify the expression of another. Understanding epistasis is essential for predicting inheritance patterns and studying traits...

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Key Terms

Epistasis
Interaction between genes where one gene masks or modifies the expression of another.

Example: In Labrador retrievers, the gene for coat color is epistatic to the gene for pigment deposition.

Dominant Epistasis
A form of epistasis where the dominant allele of one gene masks the effects of another gene.

Example: In squash, a dominant allele can prevent the expression of color genes.

Recessive Epistasis
A form of epistasis where the recessive allele of one gene masks the effects of another gene.

Example: In mice, the presence of two recessive alleles can prevent pigment production.

Modifier Genes
Genes that can modify the expression of other genes.

Example: A modifier gene can enhance or suppress the effect of a primary gene.

Phenotype
The observable traits of an organism resulting from the interaction of its genotype with the environment.

Example: Flower color in plants is a phenotype influenced by multiple genes.

Genotype
The genetic constitution of an organism, often represented by alleles.

Example: The genotype of a pea plant can determine its flower color.

Related Topics

Gene Regulation
Study of how genes are turned on and off, affecting gene expression.
intermediate
Quantitative Genetics
Focuses on the genetic basis of complex traits that are influenced by multiple genes.
advanced
Mendelian Genetics
The study of inheritance patterns established by Gregor Mendel.
beginner

Key Concepts

gene interactiondominant epistasisrecessive epistasismodifier genes