There are different types of mutations, this is important.
Human life is the length of time our dna can replicate before breakdown and mutations. Somthing about telemeres there you should read.
Environment stresses or forces faster replication why its applicable a lot.
Phages have been re-writting bacteria since the dawn of evolution, not hard and very common. Us humans have a xyXY dominant recessive (no idea were trans and self defind genders think they differ here) but plants can be far more complex which is why no one has ever cracked the hermie problem or genetics i guess.
Oh and im getting to that age where im hoping i dont have shit genetics or some recessive alzhimers (stupid word for dyslexics again) disease hidden away somewhere