Transcript Cell Cycle part 2 - Fort Thomas Independent Schools

AP Biology
The Cell Cycle
Part 2
Centrioles
Interphase
Before and after the S phase
Interphase cell
(Look at the chromatin in the blue nucleus and the
yellow cytoskeleton.)
Start of Mitosis
Cell in Prophase
Mitosis
“Division of the nucleus”
Cell in Metaphase
Cell in Anaphase
Cell in Telophase and starting
Cytokinesis
One cell becoming two
Motor Protein and the
Spindle Fibers
Chromosome
movement
Microtubule
Motor
protein
Chromosome
Kinetochore
Tubulin
subunits
Animal vs. Plant
LE 12-10
Nucleus
Nucleolus
Chromatin
condensing
Prophase. The
chromatin is condensing.
The nucleolus is
beginning to disappear.
Although not yet visible
in the micrograph, the
mitotic spindle is starting
to form.
Chromosomes
Prometaphase. We
now see discrete
chromosomes; each
consists of two identical
sister chromatids. Later
in prometaphase, the
nuclear envelope will
fragment.
Cell plate
Metaphase. The spindle is
complete, and the
chromosomes, attached
to microtubules at their
kinetochores, are all at
the metaphase plate.
Anaphase. The
chromatids of each
chromosome have
separated, and the
daughter chromosomes
are moving to the ends of
the cell as their
kinetochore microtubules shorten.
10 µm
Telophase. Daughter
nuclei are forming.
Meanwhile, cytokinesis
has started: The cell
plate, which will divide
the cytoplasm in two, is
growing toward the
perimeter of the parent
cell.
Microscopic view of Mitosis in Onion root tips.
Can you identify the stages?
Checkpoints
(Is all going according to plan?)
• Question: All organisms must be able to
reproduce to keep the species existent.
Prokaryotes undergo Binary Fission and
Eukaryotic cells undergo Mitosis. In no more
than four sentences, explain one similarity
and one difference between the two
processes. In addition, explain the evolution
link between the two processes. (5 Points)
•
• Scoring Rubric: 1pt. Discussion of one
similiarity – Cytokinesis, DNA synthesis (S), or
Maturion (G1)
• 1pt. Discussion of one difference – G2 or
Mitosis
• 1pt. Discussion of Binary fission being first
and evolving into Mitosis as DNA and
organisms became more complex over time.
• 1pt. Correct use of scientific terms.
• 1pt. Answer has no more than three
sentences. (Following Directions.)