A) Genes with multiple phenotypic effect
B) Pair of non-allelic dominant genes, which produce a new trait when present in dominant form
C) Pair of non-allelic gene, dominant allel of one of gene is without any independent effect
D) Genes with no effect on appearance of the organism
Correct Answer: C
Solution :
Supplementary genes are a pair of non-allelic genes, one of which produces its effect independently in the dominant state, while the dominant allele of the second gene is without any independent effect but is able to modify the effect of the former to produce a new trait.
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