system
Given the following post, respond as if you're commenting on Reddit:
human
So I have a cockroach problem, but my mum doesn't want to buy bug spray, because she believes that the roaches that survive will adapt and produce offspring that are completely immune to the spray. Is this true?

Edit 1: I didn't expect this post to get so big, but I want to thank you for all your replies. I'll try to reply to as many of your solutions as possible. I actually want to lock this discussion, so that more people don't reply. I already got the answer - the roaches don't get immunity to the spray, because they don't propagate as fast as bacteria and don't produce genetically identical offspring. I've also now learned that I should use boric acid powder instead of bug spray, because it clings to the body of the roaches, then they carry it to the nests, where the babies also eat it and die. I want to close the discussion, but I only see the option to hide the post. I don't want to do that because it'd be nice for people with the same questions as me to be able to find this thread. Does anyone know how to do that?

Edit 2: I got the bug spray and haven't been using it for a few hours now. I found 4 of their nests by following them and heavily sprayed the locations. They all came rushing out, then just flipped on their backside, while having some type of seizure. From what I observed, they take a long time to die from this. Something like 30 minutes. My mum says they simply passed out and will regain consciousness in a few minutes. Can they actually survive?
gpt
She has a solid, basic understanding of evolutionary biology.  That is, it may be the case that some of the survivors are more resistant to the spray, and the next generation from them will also have the same higher resistance.  However, there is no reason to suspect the offspring will be MORE resistant, except by a very small, random chance of genetic mutation.

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When you are dealing with millions of bacteria that reproduce at rates of up to every 20 minutes, these mutations can become statistically significant and you end up with highly-resistant strains. This takes thousands of generations of organisms with enormous numbers.  It will not happen with roaches in your house.

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If an individual roach builds up a tolerance over many small doses, that may be a tough roach, but its increased tolerance will not pass on to its progeny.

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Spray 'em.