Discuss the implications of the idea that most forms of psychopathology are polygenic
What are the implications anyone can contribute to this?
Answer: Phenotypes produced by a single gene produce characteristics that are categorically different. Polygenic traits (caused by more than one gene) are continuously distributed, and thus polygenic abnormal traits are on a continuum with normal traits. This point may make it difficult to determine the threshold of abnormality, which may be a question of degree rather than qualitative differences. What's more, when behavior geneticists find that a given mental disorder is "genetic," our interpretation must be cautious. This finding does not mean the disorder is caused by the presence or absence of one or two genes, nor does it confirm that the abnormal behavior is in a different category from normal behavior.
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