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How is oligogenic inheritance different from polygenic inheritance?


Asked by Augustine Chase on Dec 05, 2021 FAQ



Oligogenic inheritance represents an intermediate between monogenic inheritance in which a trait is determined by a single causative gene, and polygenic inheritance, in which a trait is influenced by many genes and often environmental factors.
Similarly,
Oligogenic inheritance. Oligogenic inheritance ( Greek ὀλίγος – ὀligos = few, a little) describes a trait that is influenced by more than one gene. Oligogenic inheritance represents an intermediate between monogenic inheritance in which a trait is determined by a single causative gene, and polygenic inheritance,...
In fact, Thus, the key difference monogenic and polygenic inheritance lies in the number of genes involved in the determination of a particular character. In monogenic inheritance, one trait is determined by a single gene whereas, in polygenic inheritance, one trait is determined by two or more genes.
Furthermore,
In Mendelian inheritance, a single gene is involved in determining a single trait. The main difference between pleiotropy and polygenic inheritance is that in pleiotropy, one gene affects many traits whereas, in polygenic inheritance, many genes affect one trait.
In respect to this,
Polygenes exhibit linkage like oligogenes. Many cases of linkage between major genes and polygenes controlling continuous variation have been reported. Thus, quantitative genetics or biometrical genetics is an extension of Mendelian genetics firmly based on Mendelian principles of heredity. 4.