Eli5 what makes everyones dna unique and how can we see that under the microscopen?

Question

I was wondering how each dna off someone is unique to another and how we can see those changes.

In: 5

Answer 1

I don’t know how to answer the first question. Everyone’s DNA is just different. It uses the same 4 molecules, just in a different order.

For your second question, we don’t see molecules with a microscope. Molecules are way too small for that. We instead use one of various chemical processes to project the sequence onto a visible spectrum. The most common ways involve 4 spectro-chemicals that each bind only to one of the four nucleotides, then using spectroscopic analysis to determine the order of the spectro-chemicals, then translating that into a sequence of nucleotides. I’m simplifying a lot here though, so take this with a grain of salt.