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title: "2.2.1 Chromosomes as units of DNA"
canonical: "https://wiki.groenkennisnet.nl/space/TAB/287605203/2.2.1%20Chromosomes%20as%20units%20of%20DNA"
format: markdown
---
Body cells of mammals and birds have a nucleus where pairs of chromosomes (units of DNA) are found. Each species has a specific number of chromosomes as is illustrated in the table below:

Number of chromosome pairs for different species

| **Species** | **Number   of chromosome pairs** |
| --- | --- |
| Man | 23 |
| Cattle | 30 |
| Horse | 32 |
| Pig | 19 |
| Sheep | 27 |
| Goat | 30 |
| Rabbit | 22 |
| Chicken | 39 |
| Duck | 40 |