User blog comment:Bioshocknall/Shepard kids pt 1/@comment-730941-20100505080958

Not even Mordin could make a human-quarian/drell/asari/turian/elcor etc hybrid. Humans can't breed with any other species on Earth, and all life on our planet is from the same source. 'Alien' life could be so fundamentally different to life on Earth that even with advanced genetics making a hybrid is impossible. It would be like making a human/flower hybrid, but so much more difficult.

This is before we consider that turians and quarians are based on dextro-amino acids, which is the opposite to every other species. This isn't a trivial thing that Mordin or another scientist could just overcome.

Even with genetic science that is centuries in advance of current human technology, it would be impossible.