We mapped the whole genome and connectome of C. elegans, no? And most of that is understood. For example, it seems to be a good model for substance addiction (especially for nicotine). That seems a pretty complex emergent behavior to me.
If you mean bigger biology, yes, sure, we don't have a full map of functional genomics for humans, but we're getting there.
Or maybe not, maybe it's so exponentially more complex, that it'd take as much time to understand it as it took for evolution to work it out. (Especially considering that evolution played with every individual, whereas we like to constrain our data gathering to non-aggressive methods.)
We have the connectome of C. elegans, yes, but we are still pretty far from understanding how it 'works'. The functional connections are still an active area of research, and it is greatly complicated by connections not explicit in the connectome (neuromodulator effects), as well as the internal dynamics of neurons and non-linear network dynamics.
The connectome is necessary, but far from sufficient, to 'understand' a brain, even one made from only 302 neurons as in C. elegans.
If you mean bigger biology, yes, sure, we don't have a full map of functional genomics for humans, but we're getting there.
Or maybe not, maybe it's so exponentially more complex, that it'd take as much time to understand it as it took for evolution to work it out. (Especially considering that evolution played with every individual, whereas we like to constrain our data gathering to non-aggressive methods.)