S4.1.4 For the adult
Cell division
When I cut my finger, it heals. Where do the new cells come from?
What this chapter teaches
In mitosis a cell copies its chromosomes and shares them into two identical cells. This is how the body grows and repairs itself. Stem cells are unspecialised cells that can divide and become other kinds of cell. Bone marrow transplants are an established use. Other uses are being researched.
Three questions to ask
There is no one right wording. Listen for the idea.
- How many chromosomes does each new cell have after mitosis, and why?
- What is a stem cell, and where is one found?
- What do some people think is wrong with using embryos, and what do others say?
After the chapter, the learner can
- Describe how mitosis makes two identical cells for growth and repair
- Explain what stem cells are and how they could treat disease
What they copy into their notebook
Mitosis: copy the chromosomes, line up, pull apart, split. Two identical cells, for growth and repair. Each division doubles the cells. Stem cells are unspecialised and can become other kinds. Bone marrow transplants are used now.