When the effects of genes add up to make the phenotype, they are called _____ genes.
A) dominant
B) recessive
C) additive
D) nonadditive

Question

Quizplus · Accepted Answer

Additive genes contribute equally to the phenotype and their effects add up, resulting in a continuous distribution of traits. Dominant genes express their phenotype even in the presence of only one copy, while recessive genes require two copies to be expressed. Nonadditive genes have effects that cannot be simply added together, such as epistasis (when one gene masks or modifies the expression of another gene).

When the Effects of Genes Add Up to Make the Phenotype