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The Cell Cycle

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on 27 January 2016

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Transcript of The Cell Cycle

Stages of the Cell Cycle
The cell gets ready to divide.
Mitosis
The purpose of Mitosis is
cell division
, making
two
cells out of one.
The Cell Cycle
The cell cycle is a regular series of events that cells go through as they
grow
and
divide
.
Learning Target:
I can identify the stages of the cell cycle and
explain what happens in each stage.
Think-Pair- Share
In what ways have you changed from the day you were born until now? What do you think have caused these changes?
Stages of the cell cycle
The main stages of the cell cycle are
Interphase
-
(Gap 1,Synthesis, Gap2)
Mitosis
Cytokinesis
Interphase
The time between cell divisions is called
interphase.
Occurs
before
mitosis begins.
What happens during Interphase?
Interphase
is divided into
three
steps or phases.
What are the stages of Interphase?
What occurs during the G1 phase?
The cell grows.
What happens during the G2 phase?
The cell grows.
What occurs during the S phase?
The cell copies and makes more DNA
Mitosis divides the
nucleus
of a cell
Mitosis is divided into
four
phases. Each phase is characterized be specific processes involving different structures
Phases of Mitosis
1.
Prophase
2.
Metaphase
3.
Anaphase
4.
Telophase
Phases of
Mitosis
Prophase
is characterized by four events
Chromosomes
condense
and are more
visible
The nuclear membrane
(envelope)
disappears
.

Centrioles
have
separated

and taken positions on the
opposite
poles
of the cell.

Spindle fibers
form and radiate
toward the center of the cell.

Metaphase
(the
shortest
phase of mitosis) is characterized by
two
events:

Chromosomes
line
up across the
middle
of the cell.

Spindle fibers
connect the
centromere
of
each
sister chromatid
to the poles of the cell.

Anaphase
is characterized by
three
events:

Centromeres
that join the
sister
chromatids
split
Sister
chromatids separate
becoming individual
chromosomes
Separated
chromatids move
to
opposite poles of the cell.

Telophase
(the last phase of mitosis) consists of
four
events:

Chromosomes
(each consisting of a
single chromatid)
uncoil
.

A nuclear envelope
forms
around the chromosomes at each pole of the cell.

Spindle fibers break
down and dissolve
Cytokinesis
Cytokinesis is the division of the
cytoplasm
into
two
individual cells.

Bellwork: Look back at your kirbys you glued and described yesterday.
(A) Explain how your first kirby and your last kirby are different.
(B) Which kirby do you think is the parent and which is the offspring? how can you tell?
Write today's date and the title
on your next notebook page.

Why do cells divide?
Repair
growth
Full transcript