Well, let's see.
(TZ2 HL)
P1 was easy. It took me literally ten minutes to solve, and I only changed one or two answers after that. Some questions I wasn't 100% sure of - couldn't remember if nucleosomes included DNA or not, then remembered that the histones alone were called something else - but in the end I doubt I lost more than two marks. Though I did get ridiculously lucky on the sickle cell anemia question: I knew the gene mutation (GAG to GTG) but not the amino acids... oh, hey, there's a table on the previous page.
What was up with the population pyramids? Geography ftw.
P2:
Uncharacteristically easy DBQ. Rest of Section A was odd; easy, but odd. The stem cell question: well, you don't have differentiation without stem cells! What else do you write? I wrote everything I could think of, then added some stuff about therapeutic stem cells - the IB seems to like that sort of thing. Also, the carrier question - why did they specify sex-linked? All carriers are heterozygotes, doesn't matter if the trait is sex-linked or not. I was a bit spooked by that, so I wrote a bunch of extra stuff - all carriers are women, that sort of thing. By the way: 50,000 magnification and 0.1 micrometres, right?
Section B: Annoying mix of nice a/b and bad c or vice versa. I really wanted to answer 9, but the first two questions put me off - I have bad experiences with IB markschemes on things like that (did "discuss benefits/dangers of vaccination" on mocks, lost five points; though that could have been because I ranted about people who campaigned against vaccination). All in all, kinda odd distribution of points - 8 for phototropism seemed too high, though I think I got most of them. Forgot some details about how the plant senses the light, I think. The other question I did was 6; that one was better, just described diabetes followed by an overview of urine production focused on glucose. a/b were easy in both cases though, once again, oddly many points for fibrous/globular proteins. And I wish the glycolysis question had been expanded for 8 - I'm really strong in photosynthesis and cell respiration.
All in all, a decent feeling. I suspect grade boundaries will be lower than last year (last year's questions were much more straightforward, I feel), and I think I did well enough to offset my bad internals.