As the science of genetics progressed, many changes were seen from Mendel’s generalizations. These are called as NeoMendelism.
The deviations from Mendel’s findings can be categorised under following heads:
1. Intragenic interactions : These interactions : are seen between the alleles of same gene. e.g. incomplete dominance and co-dominance. They are also seen in multiple allele series of a gene.
2. Intergenic interactions : Intergenic interactions are between the alleles of different genes present on the same or different chromosomes, e.g. pleiotropy, polygenes, epistasis, supplementary and complementary genes, etc.
