Dictionary > Epistasis

Epistasis

Definition
noun, plural: epistases
(genetics) The interaction between nonallelic genes at two or more loci resulting in one gene masking the phenotypic expression of another gene
(medicine) The arrest of a secretion or bodily discharge
Supplement
In genetics, epistasis pertains to the interaction of the genes at two or more loci, and as a result the effect of the gene depends on the presence of one or more modifier genes. There is that one gene or allele masking the phenotypic expression of the other genes or alleles in the interaction. That gene or allele masking the effect is referred to as epistatic. In contrast, the other gene(s) or allele(s) being masked is/are referred to as hypostatic. Epistasis may be recessive or dominant. An example of epistasis is the fur color of Labrador retrievers, which is a polygenic trait. Two genes are interacting to determine its fur color. One gene (represented by B) determines the fur color whereas the other gene (represented by E) controls the expression of the gene B. The presence of homozygous recessive alleles ee would mask the gene B (regardless of the dominant B alleles). This is an example of recessive type of epistasis.
Word origin: Greek epĂ­stasis (stopping, stoppage)
See also:


You will also like...

Still freshwater and plants
Still Freshwater & Plants

Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..

Flowers and tiny fruits of the pomegranate plant
Fruits, Flowers, and Seeds

This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..

Lotic community of algal species
Lotic Communities & Algae

Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

Non-Mendelian Inheritance
Non-Mendelian Inheritance

In this tutorial, find out more about certain types of inheritance that does not follow the Mendelian inheritance patter..

Independent Assortment and Crossing Over
Independent Assortment and Crossing Over

This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

Cambial cells
Plant Tissues

Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

Related Articles...

No related articles found

See all Related Topics