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 |