The analysis of genetic architecture in model organisms indicates that complex phenotypes are controlled by relatively few genes.

Question

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Studies in model organisms such as fruit flies and mice have shown that many complex phenotypes, including behavior and diseases, are controlled by a small number of genes with large effects. This is known as the "oligogenic" model of complex traits. However, it is also important to note that there are exceptions to this rule and some complex traits may be influenced by many genes with small effects.

The Analysis of Genetic Architecture in Model Organisms Indicates That