Unnatural selection: How far will parents go?

Picture this: prospective parents excitedly clicking through an online catalogue, ticking off the optimal mix of traits for their yet-to-be-conceived child.

Will they opt for blue eyes or brown." Perhaps green, for a touch of originality? What color skin? Are they aiming for an Olympian athlete or will they stack the deck in favor of intellectual prowess? Why not both?

For some, this would be a dream come true. For others, a nightmare of widening inequality touching on eugenics. For biologists, it raises acute questions about evolution.