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 polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic. The inheritance of polygenic traits does not show the phenotypic ratios characteristic of Mendelian inheritance, though each of ...
Polygenic traits (characteristics controlled by more than two gene loci) tend to exhibit continuous variation, with an individual’s phenotype existing somewhere along a continuous spectrum of potential phenotypes; In the case of polygenic inheritance:
Population screening for rare genetic diseases with high penetrance will continue to be a mainstay for genetic screening. However, technological developments will drive the interest in using polygenic inheritance as a risk stratifier in population screening for common disease.
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.
Polygenic inheritance definition, the heredity of complex characters that are determined by a large number of genes, each one usually having a relatively small effect. See more. Polygenic inheritance | Define Polygenic inheritance at Dictionary.com
Supplement. Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many genes in contrast to monogenic inheritance wherein the trait results from the expression of one gene (or one gene pair). In monogenic inheritance, the expression may be predicted according to a phenotypic ratio that follows Mendelian inheritance.
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 […]
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 ...
Dual Bio Chp. 11 Guided Reading. STUDY. PLAY. ... Define random event, and explain why it is significant that allele segregation during meiosis and fusion of gametes at fertilization are random events. ... Describe a simple model for polygenic inheritance, and explain why most polygenic characters are described in quantitative terms. Many genes ...