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.
The term polygenic comes from poly, meaning “many” and genic, meaning “of genes”.. Polygenic vs. Mendelian inheritance. A polygenic trait is a trait that arises from polygenic inheritance.A polygenic inheritance is a non-Mendelian, which means that it does not follow Mendelian laws.
Polygenic traits are quite different from the classical Mendelian trait in where we see that one gene controls one characteristic or one phenotype. Surprisingly, most traits in humans, and in fact most traits in most organisms, are polygenic. Mendelian traits, although we spend a lot of time talking about them, are really the exception.
Polygenic traits are the characteristics of an organism that are due to more than one gene. Simple Mendelian inheritance is valid for a single gene, but most traits are caused by the influence of many genes. Polygenic traits can vary continuously and may also be influenced by environmental factors.
ADVERTISEMENTS: In this article we will discuss about:- 1. Introduction to Polygenic Traits 2. Features of Polygenic Traits 3. Similarities between Oligogenic and Polygenic Traits 4. Analysis 5. Assumptions 6. Examples 7. Partitioning of Polygenic Variability 8. Significance of Polygenes. Contents: Introduction to Polygenic Traits Features of Polygenic Traits Similarities between Oligogenic ...
ADVERTISEMENTS: Let us make an in-depth study of the polygenic traits and quantitative inheritance. Mendel believed that a factor or gene is responsible for the expression of one character. This factor or gene has two alternate forms or alleles. The flower colour in his peas were either red or white, the seeds either yellow or […]
The traits that are determined by polygenic inheritance are not simply an effect of dominance and recessivity, and do not exhibit complete dominance as in Mendelian Genetics, where one allele dominates or masks another. Instead, polygenic traits exhibit incomplete dominance so the phenotype displayed in offspring is a mixture of the phenotypes displayed in the parents.
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.
Traits that are controlled by multiple genes and/or influenced by the environment. Penetrance and expressivity. ... Polygenic inheritance and environmental effects. This is the currently selected item. ... Biology is brought to you with support from the Amgen Foundation.