1. CELL DIVISION Mitosis and Meiosis ASEXUAL SEXUAL (EUKARYOTES ONLY)
I CAN: Compare the advantages of sexual reproduction and asexual reproduction in different situations.

2. This is a model of the double helix shape of DNA.
DNA is the molecule that transfers hereditary information from one cell to the next.
This is a model of the double helix shape of DNA.
Pg 233

3. When a cell is dividing, DNA winds up tightly and forms chromosomes in the nucleus of the cell. A Copy of DNA is needed in all cells.
A specific portion of the DNA code is called a gene, which has genetic information.
Pg 139
The genes are contained within the chromosome.

4. Humans have 46 (or 23 pairs) of chromosomes
A karyotype is a picture showing the arrangement of a full set of human chromosomes.
Humans have 46 (or 23 pairs) of chromosomes

5. HAPLOID vs DIPLOID PRACTICE
In animals…
Somatic cells (cells of the body) are diploid. This means that each cell has two chromosomes of each type. They are in PAIRS.
Biologists use “2N” to symbolize diploid.
Gamete cells (egg, sperm) are haploid. This means that each cell has only one of each type of chromosome.
Biologists use “N” to symbolize haploid.
HAPLOID vs DIPLOID PRACTICE

6. MITOSIS Mitosis In Action Pg 141
When somatic (body) cells reproduce themselves the process is called MITOSIS. 2N
Somatic Cell
Daughter Cells
Main purposes of mitosis:
Growth
Repair
Asexual reproduction (bacteria)
Mitosis leads to the production of two “daughter cells”.
Each daughter cell has the same number of chromosomes as the parent cell.
Mitosis In
Action

7. Haploid
Diploid

8. The steps of Mitosis: PAGE 141
INTERPHASE - DNA replicates
PROPHASE - chromatin condenses into chromosomes/nuclear membrane breaks down
METAPHASE - chromosomes are lined up in the middle..
ANAPHASE - Sister chromatids separate and migrate to opposite poles.
TELOPHASE - chromosomes decondense
CYTOKINESIS. division of cytoplasm

9. WEEKLY TEST – CELL REPRODUCTION AND ENERGY
IT’S TIME TO TAKE YOUR EDUCATION MORE SERIOUSLY…
FRESH …MEN AND WOMEN!!!

10. UNDERSTANDING MEIOSIS
STEP 1: GET A LINELESS SHEET OF PAPER
ON THE FRONT – GIVE TITLE
MY BODY AND
HOW IT GROWS AND
REPAIRS ITSELF!
DRAW AND DESCRIBE THE PHASES OF MITOSIS! (PAGE 175)

11. UNDERSTANDING MITOSIS VIDEO
STEP 2: ON THE BACK!!!
NUMBER TO 1- 10
GIVE THE ANSWERS (letter only) to VIDEO QUESTIONS!!!

12. The steps of Meiosis I and Meiosis II:
Pg. 175

13. MEIOSIS Pg 175 Crossing Over, pg 190
When gamete (sperm or egg) cells reproduce themselves the process is called MEIOSIS. Meiosis reduces chromosome #to half. N 2N
Gamete Cell
During meiosis, a single diploid cell divides and produces FOUR genetically different haploid cells.
In Meiosis there is one chromosome duplication followed by two cellular divisions (into four cells) so Meiosis is broken down into Meiosis I and Meiosis II.
1 N egg
1 N sperm
Upon fertilization, a “N” sperm meets a “N” egg and a zygote (2N) is formed.
2N zygote

14. MEIOSIS IN ACTION

15. Mitosis Meiosis Compare & Contrast 1 Cell Division Produces Body Cells
Produces 2 daughter cells
Daughter Cells are Diploid 2N
Daughter cells IDENTICAL to parent cells
2 Cell Divisions
Produces Sex Cells
Produces 4 daughter cells
Daughter cells are haploid N
Daughter cells are GENETICALLY different from parent cell due to CROSSING OVER of chromosomes
Compare & Contrast