1. Topics 3.2 and 3.3
Chromosomes and Meiosis (Core)

2. Eukaryote vs. Prokaryote DNA
Key Differences:
How many strands of DNA in prokaryotes?
Eukaryotes?
Organizational differences?
What is the stimulus for these differences?

3. Chromosomes in eukaryotes are linear molecules that are associated with histone proteins
Different chromosomes within an organism contain different amounts of genes as well as genes for different traits
Notice the difference between these two human chromosomes.

4. The karyotype of this individual is 46, XY
Can you describe the difference between a karyotype and a karyogram?

5. Every somatic cell in your body is a diploid cell.
Every gamete in your body is a haploid cell
Shown above are karyograms for a diploid and a haploid cell. What is the difference?

6. Two types of chromosomes in a cell:
How would this karyogram be different if the organism were different? Say drosophila melanogaster?
Autosomes (Outlined in Blue)
Sex Chromosomes (Outlined in Red)
Autosomes – determine characteristics that are common to both sexes
Sex Chromosomes – are the chromosomes that determine characteristics for the development of sexual characteristics (in addition to some other general genes)

8. The miracle of variation within a species
3.3 - Meiosis
The miracle of variation within a species

11. Check out this animation from Johnkyrk
Check out this animation from Johnkyrk.com, and see if you can identify what is happening in each of the steps of Meiosis