1. Genetics: Chromosomes and DNA
G4- I can compare the inherited structural traits of offspring and their parents

2. What is DNA?
Write what you think it is on your whiteboard

3. Genes
Genes are SEGMENTS of DNA; each one contains a different INSTRUCTION for how to make an organism.

4. What are examples of genes that you have?
List as many examples as you can on your whiteboard in 30 seconds

5. Chromosome
A chromosome is the STRUCTURE of DNA. It’s how the DNA looks in your cells!

6. Chromosome analogy: Shoes
I need 4 volunteers who would be willing to give me their shoes. Raise your hand if you would like to donate shoes!

7. Chromosome analogy: Shoes
The shoes represent PAIRS of CHROMOSOMES

8. Chromosomes
Turn to your partner: What percentage of genes/DNA/chromosomes do you get from your mom, and what percentage of genes do you get from your dad? Write it on your whiteboard.

9. Chromosomes Circle one shoe from each pair in number 4.
Each offspring gets HALF of their chromosomes from each parent.

10. Chromosomes
Humans have ____________ pairs of chromosomes.

11. Toss a coin
We are going to make some offspring from the pairs of shoes up front by randomly flipping a coin.
Heads: Right shoe
Tails: Left shoe

12. Chromosomes
In sexual reproduction, are all offspring the same as their siblings? Explain.