Video · Teachers Media
Stem cell research: the issue.
Stem cell research is one of the classic case studies for teaching ethics in science lessons — an area where the biology is fascinating, the therapeutic potential is real, and the ethical questions are genuinely contested. Handled well, it teaches pupils that science does not exist in a moral vacuum.
About this video
The GCSE biology curriculum covers stem cells in the context of cell division and specialisation, and the ethical debate around embryonic stem cells specifically. Pupils meet the biology (undifferentiated cells that can become various tissue types), the therapeutic potential (regenerative medicine, spinal-cord injury, macular degeneration), and the ethical objection (embryonic stem cells historically came from destroyed embryos, which some traditions consider morally equivalent to destroying human life).
The scientific landscape has changed significantly since the ethical debate first became public. Induced pluripotent stem cells (iPSCs) — first produced by Shinya Yamanaka in 2006, work that won the 2012 Nobel Prize — can be produced from adult cells without any embryonic source. This has substantially reduced the ethical concern for many applications, though embryonic-source cells still have some research uses that iPSCs can't entirely replace.
For teachers, this is a rich topic for structured discussion. Pupils can research different perspectives (scientific, religious, secular ethical), reason about the moral status of an embryo at different stages, and consider how they would weigh the certain suffering of existing people with degenerative conditions against the moral concerns about embryo destruction. Well-designed discussion here builds skills pupils will need for many other contested-science topics — climate change, genetic modification, AI, and so on.
The core issues worth teaching
- The biology. What stem cells are, how they differ from differentiated cells, what "pluripotent" means.
- The therapeutic potential. Existing approved treatments (bone marrow, cornea, some skin) and research areas (spinal injury, Parkinson's, macular degeneration).
- The ethical debate around embryonic sources. The moral status of the early embryo; the range of religious and secular views.
- How iPSCs changed the landscape. The 2006 breakthrough and what it did (and didn't) resolve.
- Regulation. The UK's HFEA framework and how it balances research access with ethical safeguards.
Discussion prompts
- How do you handle contested scientific topics without either avoiding the ethics or turning the lesson into an unstructured opinion-swap?
- What is the most important thing pupils should be able to say about stem cells after your teaching — biologically, and ethically?
- How does the shift to iPSCs change (or not change) the moral analysis pupils are asked to do?
Try this in your classroom
- Run a structured debate on a specific stem-cell scenario ("Should the NHS fund a trial of embryonic stem cell therapy for a rare condition?"). Assign positions rather than letting pupils argue only what they already think.
- Have pupils write two paragraphs: one explaining the biology of stem cells clearly enough for a Year 6 pupil, and one presenting a balanced ethical view. Mark for the discipline of separating the two.
- Read a current news article on stem cell research and discuss what's new since your textbook was written. Science moves; the curriculum lags.