When the effects of genes add up to make the phenotype, they are called dominant-recessive genes.

Name: When the effects of genes add up to make the phenotype, they are called dominant-recessive genes.
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When effects of genes add up to make the phenotype, they are commonly referred to as additive genes, not dominant-recessive genes. Dominant-recessive genes refer to the expression of a single gene that either masks or is masked by the expression of its alternative allele.

When the Effects of Genes Add Up to Make the Phenotype