Grainee Dhu, thank you, good post. (Your first post on this thread)
A couple quick points. For those who didn't bother reading Grainnee's post, DNA doesn't have markers, doesn't degrade, doesn't identify male/female, and needs only one cell for matching - just as my expert said.
The problem, as Grainee points out, is that the legal community uses DNA as a shorthand for Chromosomes. I asked my questions about DNA, therefore I got answers about DNA. If I'd asked about Chromosomes, I'd have got very different answers.
One could say my expert was too literal, but I think it was my fault for using the terminology that is used by the legal community. When you talk to experts, you have to keep in mind that the terminology means something very narrow and precise to them.
Any confusion that may have been created by this thread is due to my own ignorance. I should have been asking about chromosomes, but didn't know enough to know that's the terminology I should be using.
One last point, when I said my expert doesn't serve as a witness in court, I meant in criminal cases. She has testified in cases where the issues were strictly medical.
Grainnee, you seem to know quite a bit about this stuff. My we bounce questions off you?
I will continue to use DNA when posting here, as that is the terminology others are using, and it's what the legal community uses.