1. The Case of the Dividing Cell
By Lauren and Robert

2. Life Cycle of a Cell - Mitosis

Interphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

3. Interphase

Longest stage

3 stages: G1, S, G2

G1 – cell accelerates biochemical processes that
were slowed down by mitosis

S – DNA replication

G2 – chromosomes condense

4. Prophase

Spindle fiber is formed

Centrioles are duplicated

Nuclear envelope begins to break up

5. Metaphase

Chromosomes line up in center of cell

6. Anaphase

Chromosomes split

Move to opposite sides of the cell

7. Telophase

Chromosomes are completely separate

Nuclear envelope begins to reform

8. Cytokenesis

Cells split apart

Two daughter cells result

9. Cell Division –
Prokaryotes vs. Eukaryotes

Prokaryotes use binary
fission

DNA replicates; strands
attach to membrane

Cell elongates; DNA
separates

Cell wall and membrane
grow from the center of
cell causing division

Eukaryotes must go
through all the steps of
either mitosis or meiosis

10. Meiosis

1st
half (Meiosis 1) is the same as mitosis

2nd
round skips the DNA replication

4 haploid daughter cells result

11. Mitosis vs. Meiosis

Mitosis

Asexual
reproduction

2 diploid cells result

Meiosis

Sexual reproduction

4 haploid cells result

12. Crossing Over

Exchange of genetic material between
homologous chromosomes

Occurs during Prophase 1 of Meiosis

However, similarities in sequences can
cause non-homologous chromosomes to
cross over with each other.

13. Why is Meiosis Important for
Sexual Reproduction?

Sexual reproduction uses two haploid cells

They combine to produce a diploid offspring

If the cells didn't divide a second time to
make a haploid, the offspring would have
double the diploid