Re: ADHD blamed for illegal drug use and crime

On Thu, 20 Nov 2003 18:05:40 GMT, mark4asp
<[EMAIL PROTECTED]> wrote:

>I would be happy to hear that work on identifying all possible factors
>is underway - because I doubt that it can be explained solely by
>genetics if, as you say: "only one child has AD/HD in a family with
>one or more normal children"

Many disorders are genetic but not all of those are heritable. They
are caused by deletions and transpositions of gene sequences during
cell division around the time the egg or sperm is formed.

Williams' Syndrome, for example, appears to be one such condition that
is often accompanied by the features of AD/HD.