I think your warning appropriate but I'm not sure I understand or appreciate
your comments fully concerning Schizophrenia at the OMIM site. The
information there is very clear. The search lists several disorders, and
some of them have different and complex inheritance patterns. One does not
need to isolate/sequence/locate a gene or know its protein product or know
the product's function to know its heritability patterns. Gregor Mendel
derived those laws over a hundred & 30 years ago and they have since been
amended/modified to account for more complex cases(some are not convincing).
The information certainly suggests these disorders are complex and raises
the possibility that several genes may contribute to behavioral disorder(s)
which are still not very well defined. At the same time, it gives the reader
an appreciation of the struggle going on in science to better define them.
Development, Cancer, and the mind are just a few of the great frontiers in
Genetics.