Transcript Mitosis Powerpoint - Tuskegee University

10X Magnification of Stained Human Cheek Cells
Parts of the Human Cheek Cell at 40X Magnification
Can you name these parts of the Human Cheek Cell?
CELL CYCLE
During Interphase DNA replicates which must occur before Mitosis can begin .
Centrioles
: Nuclear division
View of onion root tip under low power
MITOSIS – ONION ROOT TIP
Interphase
Prophase
Early Anaphase
Anaphase
Later Prophase
Telophase
Metaphase
Later Telophase
STAGES OF MITOSIS IN WHITEFISH BLASTULA
Interphase
This cell is shown, as this is how
all cells look before mitosis. Please
be aware that Interphase is a
phase of the cell cycle, but NOT a
stage of mitosis.
Mitosis - Early Prophase
To begin mitosis, the nuclear membrane breaks down,
while the chromosomes shorten and thicken (here, a
chromosome is two chromatids, bound at a point called
the centromere, making an "X" shape). The other
structures important for mitosis are also forming (i.e. the
centrioles).
Mitosis - Metaphase
The spindle has now formed and the nuclear membrane
has broken down. The chromosomes are lined up along the
cell's center and are attached to the spindle fibers. When
the individual chromatids (½ of the "X") are separated from
the chromosome (the "X"), they are now each referred to as
a chromosome (i.e. In metaphase, the chromosome,
composed of two chromatids, separates into the individual
chromatids, which are then renamed chromosomes).
Mitosis - Anaphase
The newly formed chromosomes are pulled along the
spindle toward opposite poles of the cell.
Mitosis - Telophase
The chromosomes have finished their migration to the poles. The
spindle has broken down and disappeared. The cell membrane
pinches in (forms a cleavage furrow) along the center creating
two separate cells . At this time, the chromosomes uncoil and
become less visible (as they are during Interphase), the nuclear
membrane reforms. The division of the cytoplasm is called
cytokinesis. The division of the nucleus is Mitosis. At the end of
Telophase, the cell reenters Interphase.
The X is pointing to what structure?
What is
this????
Stay tuned for
another
activity.
Prepared by: Dr. Debbie Payne, Ruth H. Liddell, Shirley K. Scarbrough
Alabama State University, Math, Science Partnership, Winter,2013