1. Cell Division

2. Cell Division
Questions to consider…
Where? Why? How?

3. Cell Division Eukaryotic cells utilize two types of cell division:
mitosis
meiosis
Meiosis in sexual reproduction.
Mitosis in everything else

4. Why Divide? To replace dead or dying cell
To produce more cells to enlarge the organism
Reproduction

5. Binary Fission
asexual reproduction used by most prokaryotes and protists
Results in the reproduction of a livingcellby division into two equal or near-equal parts.

6. BINARY FISSION

7. SUMMARY OF MITOSIS
PARENT
CELL
GROWTH 7

8. SUMMARY OF WHAT THE DNA DOES DURING MITOSIS8

9. DNA in Mitosis Chromosome duplication Sister Centromere chromatids
distribution to
daughter
cells

10. DNA Replication during Mitosis
DNA  genes  CHROMOSOME
Count number of CENTROMERES
Sister chromatids: copied chromosomes attached at centromere

11. DNA Replication during Mitosis
KARYOTYPE: picture of chromsomes arranged into pairs
Humans have 23 pairs (46 total) chromosomes

12. DNA Replication
The Watson-Crick model of DNA structure suggested a mechanism for its replication
DNA strands separate
Enzymes use each strand as a template to assemble new nucleotides into complementary strands
Parental
molecule
of DNA
Both parental
strands serve
as templates
Two identical
daughter molecules T
Nucleotides C G A