A sudden transition to an environment without gravity or a surrounding biological biome would represent the affect of a Carrington like event.

What might have been slightly detrimental at time X is now dramatically detrimental at time Y.

At time Y genetic process come into play, whose affects would be for the most part absorbed by the population dynamics at time X.

At time Y these affects are no longer absorbed but become amplified. At the end of Cretaceous Period this lead to the extinction of dinosaur's and the emergence of birds, the earliest examples of which lived with the dinosaurs.

But this approach to genetics and evolution is not popular. There is little precedence in our history for the events that are currently occurring in our biological world, so I not disheartened to find these ideas to be not widely held.

If status quo is correct we will struggle through this period with minimal changes to ourselves as a species, although our population may decline substantially.

If the point of view I hold is correct than our time as a species could be over and the upcoming short geological period we will be the offshoot for perhaps several new and different species.