Stem Cell Stories

Stem Cell Stories

You've met stem cells. Undifferentiated cells that can become other types. Now the hard part: just because we **can** use them, **should** we? They could **replace damaged cells** and treat conditions like **type-1 diabetes** (replacing insulin-producing cells) or **paralysis** (repairing nerve cells). But the body may **reject** transplanted cells, using embryos raises **ethical** objections, and there is a risk of transferring a **viral infection**. This module puts you in the decisions: treat a patient, weigh the objections, and reach a balanced view. Exactly what a grade-9 answer does.

The patient's case

A patient with type-1 diabetes could be helped by stem cells. Work through the decisions.

• The patient would reject cells taken from a stranger. Which approach avoids rejection?
• An ethics committee reviews the plan. Which is a genuine ethical objection they might raise?
• The medical team must manage a real risk of the therapy. Which risk is genuine?

Weigh the sources

Why choose adult cells?

Why might some people prefer using **adult** stem cells rather than embryonic ones?

• Adult stem cells raise fewer ethical concerns. No embryo is used
• Adult stem cells can become any type of cell
• Adult stem cells divide much faster
• Adult stem cells are completely risk-free

Both sides

A strong exam answer gives **both** a benefit **and** an objection, never a one-sided list. This card is the shape your answer should be:

Real concerns only

Pick the TWO genuine concerns about using embryonic stem cells.

• Some people object on ethical or religious grounds
• The cells could transfer a viral infection to the patient
• They can only ever become blood cells
• They offer no possible medical benefit

Cloning plants

Stem cells are not just about medicine. Four words carry the plant half of this topic:

Complete the plant story

The tissue in a plant's root and shoot tips is called _____. Its cells can grow a whole new plant, so growers use them to make a _____ of a useful variety. That lets them mass-produce a _____ crop quickly and cheaply, or preserve a _____ species from extinction.

Spot what is missing

Here is part of a student answer on using embryonic stem cells. Tap the ONE sentence that gives an objection. The rest argue only for.

• Stem cells could replace the insulin-producing cells lost in type-1 diabetes
• .
• They could also repair nerve cells after paralysis
• .
• However, some people believe an embryo is a potential life and destroying it is wrong
• .
• The same technique clones plants quickly and cheaply
• .

Reach a view

Should embryonic stem cells be used to treat type-1 diabetes? Give a benefit and an objection, then say which way you come down and why.

• Name one specific thing the treatment could do for the patient
• Name one specific objection, ethical or medical
• Say which you find more convincing, and give your reason rather than just asserting it

In the exam

Decisions made. Grade-9 habits for stem-cell questions: • Always give a **benefit AND an objection**: treating disease (diabetes, paralysis) vs embryo ethics and infection risk. • **Therapeutic cloning** uses the patient's own genes, so the cells aren't rejected. • **Meristem** cells clone plants cheaply. Useful for disease-resistant crops and saving rare species.