1. Cell Reproduction 8.1 (p. 145-146)
DNA = deoxyribonucleic acid, a long thin molecule that contains genetic information
Instructions for how to build all of the parts (proteins) that make you
DNA is coiled and packed tightly together into structures called chromosomes
Has a famous “double helix” shape (like a spiral staircase or twisted ladder)

3. Cell Reproduction 8.1 (p. 145-146)
Chromosomes = rod-shaped structures of made of DNA and proteins
Chromosomes held together in pairs
Looks like 2 socks tied together
Each half of chromosome is called a chromatid
Each chromatid is an identical copy of the other

4. Cell Reproduction 8.1 (p. 145-146)
Centromere = “knot” or part that holds the 2 chromatids together
The centromere loosens and the chromatids separate during cell division
Each new cell receives one of the chromatids

6. Cell Reproduction 8.1 (p. 145-146)
Histones = proteins that the DNA wraps around to help it hold its shape
Like wrapping Christmas lights around a tube so they don’t get tangled

7. Cell Reproduction 8.1 (p. 145-146)

8. Cell Reproduction 8.1 (p. 145-146)

9. Cell Reproduction 8.1 (p. 145-146)