Science Buddies: "Ask an Expert"

Critically discuss the following statement. Gene expression data and systems biology is allowing us to understand the control of complex traits?

m havin bit of trouble tackling this question? any help on what I should write about or the points i shud mention would be much appreciated. I keep seeing articles about eQTL and QTL are these relevant as well? 

Thank you in advance

or should look into multi-gene traits, maybe pick my favourite illness (e.g. autism) and see how it is hereditary. Whole-genome sequencing is important tool in tracing such issues because it gives wide overview and a lot of genetic information about Patient.