it’s really funny bc like listening to english majors talk about their classes or projects theyre really articulate and they use complex words and stuff and it’s very prestigious sounding and then you listen to science majors and if theyre just talking amongst themselves it sounds…
Repeated bits example:
Telomeres are an example of a repeated segment. They’re the bits of DNA on the ends of the strands. They’re repeated sequences because every time they’re replicated (when cells divide, with each having it’s own identical, double stranded copy), part of that telomeric sequence on the end is lost in the process. If repeated sequences of base pairs that aren’t used are lost it doesn’t matter.
Now where that gets interesting is ageing. Skin losing it’s elasticity, degenerative illnesses, osteoporosis. All hypothesised to be partly due to the telomeres being all gone and actual useful DNA being eaten away at by the replication process.
Of course that’s only one hypothesis of one element. Exposure over the years to carcinogens, and general wear and tear of copies of copies of copies of copies of our DNA are also responsible. But when you consider how many times out DNA is copied in our cells from womb to tomb, it works pretty damn well most of the time.