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twin |
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twin 1. a. either of two persons or animals conceived at the same time b. (as modifier): a twin brother 2. a crystal consisting of two parts each of which has a definite orientation to the other twin [′twin] (biology) One of two individuals born at the same time. (crystallography) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| However, twin studies have consistently shown low rates of concordance (5-8%) in monozygotic and dizygotic twins (Foltynie et al. This estimate is based on studies that compared genetically identical, monozygotic twins to nonidentical, dizygotic pairs, for which the concurrence rate can be as low as 2% to 7% (19). 3) By adding dizygotic (DZ) twins to a similar study setting, exploring genetic versus shared environmental influences, the components of familial aggregation would be possible. |
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