system
Given the following post, respond as if you're commenting on Reddit:
human
Would high levels of radiation mutate animals and plant life like we see in the video game 'Fallout' and 'Metro: Last Light'? [Biology]

I am fairly sure everything would just die. I'm no expert though.
gpt
Increased radiation might increase numbers of mutations per generation such that animals are able to adapt and change more rapidly to environmental pressures, and a post-apocalyptic nuclear wasteland could provide quite an intense selection pressure for massive adaptations. On time scales of tens of thousands to millions of years, you could see quite impressive genetic drift, in theory.

However, the sorts of immediate changes you see in games like fallout are not reasonable.  High levels of radiation doesn't turn people into Ghouls, for example, it just turns them into corpses.  So you wouldn't get giant ants and scorpions (which aren't even reasonable from a physics standpoint), or most of the other things you see in fallout games.