Uploaded February 2026 | Updated September 2026, 14 hours ago

---

Find your 9s with PLUS. Click the link to try for free freesciencelessons.co.uk/modules/gcse-biology-1-triple

Teachers, to get PLUS for your school, email schools@freesciencelessons.co.uk

In this video, we start by looking at chromosomes. We then explore the cell-cycle involving mitosis and why this is important.

This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Biology. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.

Image credits:

Cheek cells

commons.wikimedia.org/wiki/File:Cheekcells_stained.jpg

Mulletsrokk, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons