Biological explanations of schizophrenia focusing on genetics compare concordance rates in twins, which are the percentage of:

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Concordance rates in twins, especially in the context of studying schizophrenia, refer to the percentage of twin pairs where both twins have the disorder. This is used to assess the genetic contribution to the disorder. Identical (monozygotic, MZ) twins share 100% of their genes, while fraternal (dizygotic, DZ) twins share about 50% of their genes, similar to regular siblings. Higher concordance rates in MZ twins compared to DZ twins suggest a genetic component to the disorder.

Biological Explanations of Schizophrenia Focusing on Genetics Compare Concordance Rates