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In animal breeding a general assumption is that traits are determined by an infinite number of genes, each with a very small effect, so that the bell-shape is very smooth. It is also assumed that this infinite number of gene effects are all additive. The model underlying this assumption is called the infinitesimal model.
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DefinitionThe infinitesimal model assumes that all traits are determined by an infinite number of genes, each with an infinitely small effect. This assumption results in a smooth bell-shaped distribution that can be described by the Normal Distribution. This distribution comes with a number of rules that animal breeding theory is built on. |
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