1. Meiosis and Reproduction
Warmup
Fill in the following table.
P C
M M
A P
T N

2. Interphase In between P Prophase C Condense M Metaphase Middle A
Stage
What happens
Interphase
In between P
Prophase C
Condense M
Metaphase
Middle A
Anaphase
Pull Apart T
Telophase N
New Nucleus
Cytokinesis
Cutting

3. Review Mitosis Cell Cycle What is the goal of mitosis?
Reproducing cells
What is the goal of mitosis?
To make new cells
Reproduce
Grow

4. Chromosomes in mitosis
We are making an exact copy of a cell
How many chromosomes before Mitosis
23 Pairs or 46 chromosomes in humans
How many after Mitosis.
23 pairs or 46 chromosomes
How many during mitosis

5. Come up with diagram Draw a cell that has 4 chromosomes Before mitosis
During Mitosis
After Mitosis

6. Reproduction Copying of cells Asexual Binary fission Only one parent
Producing offspring exactly the same as parent. No variety
Binary fission
Bacteria Splitting similar
To mitosis to make new cells.

7. Meiosis The process of making new sex cells.
Used in Sexual Reproduction
Ends up with four sex cells
Half the number of chromosomes.

8. Sexual Reproduction Reproduction using two parents
If you combine two sex cells you make a zygote.
Zygote is a combination of chromosomes.
forms baby with a variety of dna
What happens to the number of chromosomes in the zygote?

9. Come up with diagram Draw a cell that has 4 chromosomes Before Meiosis
During Meiosis
After Meiosis

10. Meiosis makes 4 cells
Each cell has HALF the original chromosomes.

12. Diagram cells
How many do we start with
How many chromosomes

13. Characteristics Mitosis Meiosis
Definition of the process
When the nucleus is copied
The process of making 4 new sex cells with half the chromosomes as the original.
Purpose of the process
Asexual Reproduction; Repair/replace cells; Growth
Sexual Reproduction
Type of Original Cell
Body Cell
Reproductive Body Cell/Sex cell
# of Cell Divisions 1 2
Name of Cells Produced
Daughter Cells/body cells
Sex Cells
# of Cells Produced 4
Comparison of DNA in
End Cells to Original Cell
Identical
Not same
Comparison of Number of Chromosomes In End Cells to Original Cell
Same
One-Half

14. If I have a grasshopper with 18 chromosomes.
How many does each cell have after mitosis?
18 each.
How many does each cell have after meiosis 9