What is a strength of the genetic explanation?

-Research support to suggest that there is a link between genetics and OCD from twin stuides -Nestadet found higher concordance rates in MZ twins compared to DZ tiwns. 68% concordance rate for MZ twins and 31% concordance rate for DZ twins -Billet conducted a meta-analysis of 14 twin stuides, found that MZ twins are x2 more likely to develop OCD if their co-twin had OCD. -Though it shows a link betwen OCD and genetic makeup, it can't be said that its only genetic seeing as there isn't a 100% concordance rate - suggests that there are other factors that play a part in OCD, like the daithesis-stress model