Gene vs. Chromosome: What's the Difference?
Read the comparison below, or explore it visually. Create a visual lesson comparing gene and chromosome using available credits or plan allowance.
It's a matter of scale — both are made of DNA, but a chromosome is much bigger. A gene is a single instruction: a stretch of DNA that codes for one trait or protein (like eye colour). A chromosome is a long, tightly-coiled package of DNA that carries thousands of genes strung together. So genes live ON chromosomes — think of a chromosome as a book and each gene as one recipe inside it. Humans have about 20,000 genes packed onto 46 chromosomes.
At a glance
| Gene | Chromosome | |
|---|---|---|
| What it is | One instruction in DNA | A bundle of many genes |
| Size | A short stretch of DNA | A very long DNA package |
| How many (human) | ~20,000 genes | 46 chromosomes |
| Holds | Code for one trait/protein | Thousands of genes |
| Analogy | One recipe | The whole recipe book |
Which should you use?
Talk about a gene when you mean a single heritable instruction — the gene for a particular trait or protein.
Talk about a chromosome when you mean the larger structure that stores and organizes many genes together.