There are genetic predispositions to dissociation but like the others said, DID is trauma related.
BUT what counts as trauma for DID is more often than not related to attachment issues and the attachments issues go from generation to generation. If the parents / caretakers dissociate and/or are unable to form a safe attachment with their child due to their own DID or other trauma, the child will develop dissociation in response and can develop DID. You will find articles on the subject linked in >>
this post <<
Nothing to do with chromosomes. Also, the sexual chromosomes are less magical than you think and have less to do with sex than you think. As an example they contain a lot of genes related to the eyes. As an example there is a Y chromosome dependant variant of >>
Retinitis pigmentosa <<. In cats, they also contain genes for fur color, which is why >>
only female cats or intersex male cats can have the tortoiseshell coloration <<. There is only ONE gene sex-related on the sexual chromosomes and that is the >>
SRY gene << coding for the production of testosterone in the foetus. This is the ONLY thing that will make the difference between a baby born with female phenotype or male phenotype. And it's not the exclusive gene coding for that: genes related to the >>
sensitivity to the hormones are in action too << and depending on the combination of factors it can lead to a wide range of intersexuations. >>
This wikipdia article << contains a fair amount of informations on the subject as well as the debate around how to define intersex - usually doctors have a way stricter definition than the people who fight for intersex human rights. As an example, human rights activists include me among the intersex people because I faced discriminations and medical mistreatment due to my >>
hormone imbalances << while doctors say I'm not intersex because my chromosomes are consistent with my assigned at birth sex. Which has nothing to do with me being trans btw, that's another can of worms.