Polygenic inheritance is controlled by two or more pairs of nonallelic genes. In which the dominant alleles have a cumulative effect. Each dominant gene added will add to the character and the result will be an additive effect of all dominant genes. These genes are Polygenes and such type of inheritance is Polygenic inheritance. It is also referred as a Quantitative inheritance & Multiple genes interaction.
These genes don’t follow the Mendelian pattern of inheritance.
These characters are affected by environment.
Continuous variation occurs. The offsprings can be divided into a range of classes.
- Kolreuter first studied polygenic inheritance.
- Galton studied it in man.
- Nelson-Ehle gave the experimental proof.
- kernel color in wheat.
- cob length in Maize.
- skin color in man
- height in man.
- IQ in man.
- crop yield, milk yield etc.