How is complementarity manifested? Why is this type of gene interaction also called complementarity?

How is complementarity manifested? Why is this type of gene interaction also called complementarity? Give examples of the manifestation of complementarity.

With complementarity, two non-allelic genes, being together in the same genotype, determine the development of a new trait. In this case, there can be different types of splitting in the second generation – 9: 3: 3: 1; 9: 7; 9: 6: 1; 9: 3: In the first generation, a neoplasm is observed. Examples: the shape of the crest of chickens, the inheritance of the color of sweet pea flowers.

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