Understanding Quantitative Traits

Although all quantitative traits are multigenic traits, not all multigenic traits are quantitative traits. Strictly speaking, a multigenic trait is any trait controlled by more than one gene, yet when only a couple of loci are involved, researchers can sort out all the different combinations of outcomes and understand the phenotypes, as in the squash color example in the earlier section. As the number of genes gets larger, doing that isn't so easy, so scientists have to use the mathematics of quantitative genetics.

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