Introduction to the Complementary Gene Interaction

Complementary gene interaction is an intergenic or interallelic gene interaction in which two dominant genes express themselves to the same character; independently;  however, when they are combined together, they express to a different character. In other words, two dominant genes when combined, complement to each other.

Complementary gene interaction is present in sweet pea (Lathyrus odoratus). There are two varieties of sweet pea plants -- both produce white flowers. However, when two varieties are crossed together, purple flowers are formed. I have described everything about complementary gene interaction in the video below:

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