1. Family Patterns Introduction

2. Copy this table into your exercise book and use the following information to complete it
Mitosis
Meiosis
Where in the body does it occur?
How does the number of chromosomes compare between parent and daughter cells?
What is the purpose of this sort of cell division?

3. An overview of the genetic system

4. How gametes are formed

5. Let’s make sure that we have all the answers.
Mitosis
Meiosis
Where in the body does it occur?
How does the number of chromosomes compare between parent and daughter cells?
What is the purpose of this sort of cell division?
Only in the gonads
All cells except in the gonads
- Ovaries and testes
Exactly the same – the cells are identical in every way
Daughter cells have ½ the number of chromosomes
To produce identical cells so that each cell has a full set of instructions and can carry out the same functions (ie for growth and repair)
To halve the number of chromosomes so that when gametes join (fertilisation) they have the correct number of chromosomes and also to produce variation

6. What determines the sex of humans

7. Meiosis and twins

8. Cystic Fibrosis

9. Huntingdon’s Disease