DNA vs. Gene: What's the Difference?
Read the comparison below, or explore it visually. Create a visual lesson comparing dna and gene using available credits or plan allowance.
The difference is whole versus part. DNA is the long molecule that carries all of your genetic information, written in a chemical code. A gene is just a specific segment of that DNA — a single 'instruction' that codes for a particular protein or trait. Think of DNA as the whole book and a gene as one sentence in it.
At a glance
| DNA | Gene | |
|---|---|---|
| What it is | The full genetic molecule | A segment of DNA |
| Scale | Entire code (billions of letters) | One instruction (a stretch of letters) |
| Job | Stores and passes on all information | Codes for one protein or trait |
| Analogy | The whole cookbook | A single recipe |
| How many | One genome per cell | ~20,000 genes in humans |
Which should you use?
You're talking about DNA when you mean the molecule itself — the double helix that holds the complete set of instructions and gets copied and passed to new cells and offspring.
You're talking about a gene when you mean one functional unit of that code — the part that determines a specific feature, like eye colour or a particular enzyme.