Polygenic traits are those traits that are controlled by more than one gene. Such traits may even be controlled by genes located on entirely different chromosomes. Human height, eye and hair color are examples of polygenic traits. Skin color is another polygenic trait for humans and a variety of other animals.
Polygenic traits also have dominant and recessive alleles, but so many genes play a role in an organism’s phenotype for these traits that the final result is the sum of many complex interactions. It can be hard or impossible to figure out one gene’s effect on a polygenic trait.
Almost any trait that you can observe in a normal person is polygenic. Height, weight, strength, IQ, nearly all personality traits, hair color, skin color, homosexuality, ability to tolerate high altitudes, resistance to most diseases, etc. are mo...
A "polygene” or "multiple gene inheritance" is a member of a group of non-epistatic genes that interact additively to influence a phenotypic trait. The term "monozygous" is usually used to refer to a hypothetical gene as it is often difficult to characterise the effect of an individual gene from the effects of other genes and the environment on a particular phenotype.
A quantitative trait locus (QTL) is a region of DNA which is associated with a particular phenotypic trait, which varies in degree and which can be attributed to polygenic effects, i.e., the product of two or more genes, and their environment. These QTLs are often found on different chromosomes.The number of QTLs which explain variation in the phenotypic trait indicates the genetic ...
Biology-online is a completely free and open Biology dictionary with over 60,000 biology terms. It uses the wiki concept, so that anyone can make a contribution.
Polygenic traits are not only observed in human beings, but are also present in animals, birds, insects, flies, etc. In terms of human genetics, these traits are defined as inherited characteristics when two or more genes are involved in determining the phenotype of an individual.
Types of Polygenic diseases including less common types and symptoms and diagnosis of the correct subtype.
If variety is the spice of life, polygenic inheritance is one genetic mechanism giving us a continuous range of possibilities. In this lesson, learn how a polygenic trait, like height, can be ...
Polygenic inheritance is a type of incomplete dominance inheritance, where the expressed phenotypes are a mixture of inherited traits. Polygenic traits have a bell-shaped distribution in a population with most individuals inheriting various combinations of alleles and falling within the middle range of the curve for a particular trait.