According to the threshold model, for a family in which a disorder occurs, the risk of the disorder decreases as relatedness decreases.

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The threshold model suggests that genetic factors play a role in the development of some disorders, such as schizophrenia. Therefore, as relatedness decreases (i.e. moving from first-degree relatives, to second-degree relatives, to unrelated individuals), the shared genetic risk decreases as well. This means that the risk of the disorder occurring within the family decreases as relatedness decreases.

According to the Threshold Model, for a Family in Which