Speed of mutations

I'm planning on setting a story on Earth where the Sun is slowly becoming a red giant. I guess with so much solar activity and probably less atmosphere and magnetic field, the surface of our Earth will be hit by lots of ionizing radiation.

Given that ionization favours mutation: is it scientifically possible that some animals (or even humans) has developed resistance to radiation and maybe some very visible mutation in their body after a rather small period of time (a couple of hundred years)?

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Speed of mutations

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