1. Chapter 8: Cell Reproduction & Genetics
8.1: Chromosomes
Do Now: Please answer the following questions on your handout:
1. What part of a eukaryotic cell are chromosomes found in? Hint – they’re made of DNA.
2. How are genes related to chromosomes?

2. Unit 6: Cell Reproduction & Classical Genetics

4. Unit 7: DNA & Molecular Genetics

6. Unit 8: Ecology

7. Unit 9: Evolution

8. Unit 10: Body Systems

9. Chromosomes

11. Chromosome Structure DNA strand Gets wrapped around many
histone proteins
(aka histones)
forming a
coil.
Coils are coiled up even more to form a
supercoil,
which is then packaged
even more to make a
chromosome.

12. What’s the big idea?
Most of the time, DNA is uncoiled, so that it can perform its function of providing instructions to the cell.
Only during cell reproduction does DNA get tightly packed into chromosomes

13. Parts of a chromosome The 2 chromatids that make up a chromosome
are called
sister
chromatids,
which are
extremely
similar
to each
other.

14. Constructing Model Chromosomes
Your group has been given enough materials to make 4 model chromosomes. There should be 3 parts to each model chromosome:
2 sister chromatids
1 centromere
How many chromosome
models could be built
using the parts shown
here?

15. Evaluating Your Model What do our models represent well?
Some Questions
What do our models represent well?
What characteristics don’t they represent so well?
Draw a sketch of your model into your notes, and
Bring them to class tomorrow – we’ll be using them again!

16. Tonight’s Homework:
Read pp ;
Questions #2-3 p. 147