1. Objectives Name three parts of the cell cycle.
Name four major parts of mitosis.
Identify important parts of a dividing cell.

2. The cell cycle has three major parts:
Interphase
Mitosis
(Karyokinesis)
(Mitosis has four major sub-parts)
1) Prophase
2) Metaphase
3) Anaphase
4) Telophase
Cytokinesis

3. Interphase Characterized by: Intact nuclear envelope Visible nucleolus
Although you can’t tell it,
the cell’s DNA and other
cell components are undergoing a process called replication (duplication process); chromosomes become double-stranded.
4. Three sub-phases: G1, S, and G2
Nuclear envelope
Nucleolus

4. Condensed chromosomes
Mitosis = Karyokinesis
Prophase
Characterized by:
Disappearing nuclear envelope
and nucleolus
Chromosomes (46* in each human cell) coil and condense
Spindle fibers (microtubules)
form and chromosomes become attached by way of centromeres
Newly formed centrioles
move to opposite ends of the cell
*23 pairs of chromosomes
Condensed chromosomes
(chromatin fibers)

5. Mitosis = Karyokinesis Metaphase
Characterized by:
Chromosomes align across the
“equator” or metaphase plate
Centrioles stop at opposite
ends of the cell
Spindle apparatus is fully
formed
Spindle
apparatus
Centrioles
Centrioles
Metaphase plate

6. Shortening microtubules
Mitosis = Karyokinesis
Anaphase
Characterized by:
Spindle fibers (microtubules)
shorten and separate the
chromosomes at the
metaphase plate
In the human cell, 46 single-
stranded chromosomes move
in opposite directions toward
each pole
Centrioles
Centrioles
Shortening microtubules
(spindle fibers)

7. Can you name structures in the dividing cell?
single-stranded chromosome
centromere
centrioles
spindle fiber (microtubule)

8. Mitosis = Karyokinesis Telophase
Characterized by:
Cleavage furrow forms
Nuclear envelopes begin to
form around two daughter
nuclei
Chromosomes decondense
Spindle disappears
Cytokinesis
(Division of cytoplasm and
contents into two cells)
cleavage furrow
daughter nuclei

9. This figure represents an overview of the cell cycle.