Jellybean,

I like your train analogy. You'll find many passengers on this board that can answer your questions, or at least help with the unknowns. Use the search function on this board. Type in a key word, and get real-life experiences and explanations.

Morphologic is defined as "Describing the form and structure of an organism or any of its parts", so it sounds like they are saying the two samples have some of the same traits.

Ditto what August said. There will be a lot of terminology thrown around. Write it down. Same goes for the questions you have, but aren't in front of a doctor at that time.
This site is an excellent resource too. It had a very positive effect on my journey.

Best of Luck, and keep that attitude up!
Mike