Question: If someone within your family is diagnosed with a certain disability such as Dyslexia and they're a generation behind you, does this mean that everyone coming from their offspring will have a small amount of Dyslexia within their DNA. Such a small percent that it couldn't diagnosed by any form of current testing but sometimes enough to influence them?

anon answered on 9 Mar 2017:

What you indicate in your question or what I gather from it is, if Dyslexia is genetic and if it is, is it dominant throughout the generations?

Well it certainly is genetic. However, it depends on where it all started from. If it’s origin was genetic, it is likely to carry on for generations. If not, and it has appeared as a nuerological defect, there are less chances of that being passed on genetically.

There are papers out there which statistically show that Dyslexia can be genetic, some showing that the genetic vs independent nuerological occurance is higher. However, bear in mind statistics cannot ‘always’ be relied upon. So it’d be interesting to see how its origin and occurence can be traced and then if it can be genetically controlled for in future generations too.

Lastly, Dyslexia the term itself is for the nuerological condition that has delveoped and apparent. However, as you stated there are confounding nuerological factors which may impair certain brain functions or at least diminish over time. I am not too sure if this can be termed as Dyslexia. It can surely be collectively termed as a disability, but not sure if minute impairments or nuerological defects that go undiagnosed but yet affect one’s normal function can be termed as Dyslexia.