Non allelic gene interaction.pptx

the slide describes various types of non allelic interactions of genes.

1. Non allelic gene interaction

2. Complementary gene interaction (9:7) Here two or more independent genes present on same loci or different work together to create a specific phenotype. They are called complementary because they cannot express without each other. Bateson and Punnett crossed Lathyrus odoratus . The white flowers of Lathyrus is represented by both CCpp and ccPP genes. When they were crossed, in F1 generation ( CcPp ) all plants produced purple flowers. The F2 generation was raised and both purple and white flowers were obtained at a ratio of 9:7 .

3. (13: 3)

4. (15: 1)

5. Epistasis

6. Dominant epistasis 12:3: 1

7. When recessive alleles at one locus mask the expression of both (dominant and recessive) alleles at another locus, it is known as recessive epistasis. The modified phenotypic ratio is 9:3:4.