> Genetics is not a credible science

This is a far stronger claim than I think you mean. We have a ton of evidence that those bits of DNA in our cells govern cell expression and even know in some cases that bit X being malformed causes bad condition Y (sure, you could hypothesize that they both have a common cause, but how the heck would that work? Correlation being causation works if both common cause and backwards causation are implausible, as they are often in genetics).

> but not a very good one as even they don't have the same genetics

Uhhh... they have almost exactly the same genetics. To a similar extent that two random cells from your body will have the same genetics. Yes, there will be a handful of mutations, but that's very unlikely to have an effect on any particular trait.

Genetics experiments are quite commonplace these days, for example in vaccine development, plant engineering, and many other applications

I mean on humans.

Your claim that genetics, a science affecting all life, is not a credible science, doesn't mention humans at all, so I doubt you did.

If you have to limit it to "humans only", the claim falls apart anyways, because genetics isn't human-specific

Your idea of an argument is to say that people don't know what their own posts mean?

Who are you to tell us to not trust our eyes? When you're wrong at trivia, can you just claim "I meant [the right answer]"? If that's what you meant, perhaps you would have said it, but if you would had said it, it would have ruined your argument.

Simply put, you haven't made a convincing case that genetics, a science affecting all life, not just humans, is "not a credible science", despite indeed involving experiments all the time.

Below is where you can make that case.