If you are not qualified in genetics then how can you check the work of the professionals? Trust me when I say that in science there is a thing called peer review; whereby scientists of the same field review the work of their colleagues and pass judgement. This system in science is what keeps science from being infected with pseudo-scientific works and all manner of supernatural beliefs.
I have to go to many sites and compare. If i want to know about how it works i will go to the science sites which are more technical where they will have breakdowns of the particular topic. But then it can start to go over my head and i take in as much as i can. Then i try to find sites that can explain it in everyday language though they may not go into as much detail and you have to be careful with personal opinions. Some say to only have peer reviewed backup but i have seen many different references qualities. Its hard when there is a mixer of knowledge levels and no real criteria for what is acceptable backup or not laid down in black and white.
I will also look at the religious sites to get their point of view. Its hard for someone who hasn't had training as they will not know what they are looking for. But you begin to understand better as you go if you are willing to learn and spend some time doing research. But if you dont have that level of knowledge required in genetics then its hard. Still i like to debate it as i can throw things out there and see what others say.
Scientists indeed do make mistakes but they learn from them just as you learnt to walk by falling. Every time we learn we increase our knowledge and as knowledge grows we understand more but in an exponential way.
Mistakes are made in all walks of life. But if you want to find out about something then you go to the ones that know. This doesn't mean they will make mistakes sometimes and you shouldn't put them on to high a pedestal and take everything they say as gospel. You have to get opposing views to test and see if what they say is correct. Sometimes peoples personal views can get in the way.
What we learn in 1 year today, took centuries before. This my good friend is what science is all about. Oh and by the way; it demands a lot of hard work too.