DNA is essential to human life. DNA is the code that your cells use to reproduce. It is kept well and safe inside the cells nucleus so that it can't be broken (though there are a few exceptions).
To Cranky Old Man, DNA is to small to have a photon taken using ordinary light as it is smaller than that particular lights wavelength. Here is a picture of a large clump of DNA rolled together.

And here is a picture of DNA taken with an electron microscope. Electrons, unlike light have very small wavelengths sometimes so they mike the perfect instrument for taking pictures of extremely small things. A nm is 1 billionth of a meter

And Mitza, you did provide some colorful pictures and did explain how damage to the brain can impede its functions, but that is not what down syndrome is.

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