By Team Aakash Byju's
Three researchers: de Vries, Correns and Tschermak, rediscovered the fundamental ideas of heredity in 1900 after Mendel had discovered them in 1866.
These new concepts were distinct from Mendel's discoveries and are referred to as Post 'Mendelian Genetics'.
There are two types of gene interactions: – Intragenic Interactions – Intergenic Interactions
Intragenic interactions between two alleles of the same gene result in a phenotype that is different from the typical dominant-recessive phenotype.
Incomplete dominance, codominance and multiple alleles are common intragenic interactions.
Intergenic interactions take place between the alleles of various genes located on the same or distinct chromosomes.
Complementary genes, auxiliary genes, polygenes, epistasis, pleiotropy and deadly genes are examples of common intergenic interactions.
When two genes of an allelomorphic pair are present simultaneously, they exhibit an intermediate condition known as ‘Incomplete Dominance’.
Multiple alleles are genes that have more than two allelic variants. In such instances, the mode of inheritance is referred to as multiple allelism.