Key Stage 3
Meaning
Chromosomes are coils of DNA found in the nucleus.
 |
| This diagram shows how DNA is coiled up to make a chromosome. |
About Human Chromosomes
- Humans have 46 chromosomes.
- Chromosomes come in pairs, one from the father and one from the mother.
- 23 chromosomes are from the father and 23 chromosomes are from the mother.
- The last 2 chromosomes are called sex chromosomes and they determine if the offspring is male or female. If the human has two X Chromosomes then they are female. If the human has an X and a Y Chromosome they are male.