I think the part about the SNPS is what I'm looking for. I have another thread under autosomal:http://boards.ancestry.com/topics.dnaresearch.autosomal/37/m...
To summarize, I just got back my mom's results and although we are matched by DNA as parent/child, we share 0% ethnicity. The only way I can see this as being possible is if the relationship and ethnic groups are based at totally different "aspects" of the DNA. I funderstand what you are saying, that is indeed the case.