The Brett Middleton post in the FHL Archives is well worth reading on
this.  He's a geneticist and professor, and his post on the topic is
very good:
http://fhl.sonic-weasel.org/browse.php?msg=YG3069
 
On the FML there were a recent discussion:    [that's FHL, not FML. BIG]
http://www.smartgroups.com/message/viewdiscussion.cfm?gid=1423922&messageid=3227
which had interesting viewpoints and then the poster's question and a
tie-in are in a separate tiny group:
http://www.smartgroups.com/message/viewdiscussion.cfm?gid=1423922&messageid=3280
I thought that Danee raised a point that is well worth serious
consideration.
[Posted in FML issue 4061]