DNA Explained Simply
DNA (deoxyribonucleic acid) is the blueprint for every living thing. It's packed into almost every cell in your body and contains all the information needed to build and run your body.
The two strands twist around each other like a twisted rope ladder - that's the famous double helix shape.
đź’¬ Mia asks Grandpa Theo
If DNA is a blueprint, how does it fit inside a tiny cell?
It's wound up incredibly tightly! If you fully unrolled the DNA from a single cell, it would be about two meters long - and yet it fits inside a nucleus smaller than the dot on this i.
And what exactly is written in there, if it's not sentences like in a book?
The order of the four bases A, T, G, and C is like a text written with only four letters. Certain stretches of that sequence are called genes - each gene is basically the blueprint for a specific protein your body needs.
Why do the bases always pair up A with T and G with C - never any other way?
Because the shape of the bases only fits together that way, like puzzle pieces. That's really handy: when DNA copies itself for cell division, each strand automatically "knows" which matching strand needs to be built next to it, thanks to that fixed pairing.
A DNA test between siblings often shows surprisingly big differences: each child gets a fresh mix of DNA from mom and dad, so siblings look similar but not identical (except identical twins).
DNA and genes don't decide everything on their own - your environment (diet, experiences, lifestyle) also influences which genes actually get "read".
← Back to overview