Q. Which one is correct statement for supplementary genes?

1. Genes with multiple phenotypic effect
2. Pair of non allergic dominant genes which produces a new trait when present in dominant form
3. Pair of non allelic gene dominant allele of a one of gene is without any independent effect
4. Genes with no effect on appearance of the organism.

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Please find answer to your question below:

Correct answer is 3. pair of non allelic gene dominant allele of a one of gene is without any independent effect.
Supplementary genes are a pair of non allergic genes, one of which produces its effect independently in the second gene is without any independent effect but is able to modify the effect of the former to produce a new trait.