The ratio of complementary genes is ....

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(D) Complementary genes are two independent pairs of genes that interact to produce a specific phenotype,where each gene is required for the expressio

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$9:7$

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(D) Complementary genes are two independent pairs of genes that interact to produce a specific phenotype,where each gene is required for the expression of the other. In a dihybrid cross involving complementary genes,the phenotypic ratio observed in the $F_2$ generation is $9:7$. This occurs because the presence of at least one dominant allele for both genes is necessary to produce the dominant trait; otherwise,the recessive phenotype is expressed.

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