1. WARM-UP#7
What type of cell division is the diagram above?
What phase of cell division the arrow pointing to?

2. Characteristics of living things
REMEMBER THE…
Characteristics of living things
Living things are made up of cells
Unicellular – one celled organisms
Multicellular – many celled organisms

3. Characteristics of living things
Living things reproduce to make offspring of the same species
Sexual reproduction
Asexual reproduction

4. Characteristics of living things
Living things grow and develop

5. MEIOSIS PROCESS OF REDUCTION DIVISION
(CHOROMOSOME # IS CUT IN ½ BY SEPERATION OF HOMOLOGOUS CHROMOSOMES IN DIPLOID CELLS)

6. Chromosome number in body cells vs. gametes?
Diploid (2N) - have 2 sets
Gametes:
Haploid (N) - have 1 set

7. Summarize the events of meiosis. (See also #5)

8. Summarize the events of meiosis. (See also #5)

9. What are the results of meiosis?
4 haploid (N) cells
Genetically different from each other & the original cell

10. Differences between Mitosis & Meiosis?
MITOSIS produces 2 identical diploid (2N) cells
MEIOSIS produces 4 different haploid (N) cells

11. Human cells 2N=46. How many chromosomes are in a…?
Sperm Cell?
23 chromosomes
Gamete is haploid (N)
Egg Cell?
White Blood Cell?
46 chromosomes
Body cell is diploid (2N)

12. How does independent assortment apply to chromosomes?
The “chromosomes” assort independently, not individual “genes”

13. Crossing-over & gene mapping?
Farther apart 2 genes are, more likely they’ll be separated
Frequency of crossing-over = to distance between 2 genes
library.thinkquest.org/ 19037/genome3.html

14. How close are 2 usually independently assorted genes?
Very far apart from each other.

15. biology.clc.uc.edu/ courses/bio104/meiomito.htm

16. MEIOSIS FOLDABLE

17. ?
Any Questions???