The multiple factor hypothesis suggests that many factors or genes contribute to the phenotype in a cumulative or quantitative manner.

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The multiple factor hypothesis proposes that complex traits are influenced by multiple genes and environmental factors, and that these factors interact in a cumulative or additive fashion to determine the final phenotype. This is in contrast to the idea that a single gene or factor is responsible for a particular trait or characteristic, which is often the case with simple or Mendelian traits.

The Multiple Factor Hypothesis Suggests That Many Factors or Genes