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(B) Complementary genes are two non-allelic genes that independently produce no effect but interact to produce a specific phenotype.In the $F_2$ gener

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Complementary genes

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(B) Complementary genes are two non-allelic genes that independently produce no effect but interact to produce a specific phenotype.In the $F_2$ generation of a dihybrid cross involving complementary genes,the phenotypic ratio is modified from the standard $9:3:3:1$ to $9:7$ because both dominant alleles are required for the expression of the trait.If either gene is present in the homozygous recessive condition,the trait is not expressed,leading to the $9:7$ ratio.

Genes that are similar in phenotypic effect when present separately,but together interact to produce a different trait and the ratio is $9:7$ in the $F_2$ generation. What are such genes known as?

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