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Transcript
Happy Tuesday Buffs!! Read Below
1. TURN IN YOUR CODON FACE ASSIGNMENT IF YOU HAVE IT.
2. BELLWORK: WRITE YOUR ANSWER TO THE FOLLOWING
QUESTIONS…
A. WHAT ARE THE 6 PHASES OF THE CELL CYCLE?
B. AT WHAT PHASE DO THE CHROMOSOMES LINE UP?
C. DURING WHAT PHASE IS DNA REPLICATED?
Happy Tuesday Buffs!! Read Below
A. WHAT ARE THE 6 PHASES OF THE CELL CYCLE?
INTERPHASE, PROPHASE, METAPHASE, ANAPHASE,
TELOPHASE, CYTOKINESIS
B. AT WHAT PHASE DO THE CHROMOSOMES LINE UP?
METAPHASE
C. DURING WHAT PHASE IS DNA REPLICATED?
S-PHASE
IF YOU HAVE NOT TURNED IN YOUR CODON
FACE ASSIGNMENT….
Grades
Tests
Essential Question: Am I able to
identify and analyze phases of the
cell cycle?
Onion Root
Tip
Interphase: Nucleus is still visible
Most cells are in this phase (G1, S,
G2)
Interphase: Nucleus is still visible
Most cells are in this phase (G1, S,
G2)
Prophase: Nucleus disappears,
Individual chromosomes condense
and are visible.
Interphase: Nucleus is still visible
Most cells are in this phase (G1, S,
G2)
Prophase: Nucleus disappears,
Individual chromosomes condense
and are visible.
Metaphase: Chromosomes move
to center of the cell and line up.
Interphase: Nucleus is still visible
Most cells are in this phase (G1, S,
G2)
Prophase: Nucleus disappears,
Individual chromosomes condense
and are visible.
Metaphase: Chromosomes move
to center of the cell and line up.
Anaphase: Chromosomes move
apart to opposite sides of the cell.
Interphase: Nucleus is still visible
Most cells are in this phase (G1, S,
G2)
Prophase: Nucleus disappears,
Individual chromosomes condense
and are visible.
Metaphase: Chromosomes move
to center of the cell and line up.
Anaphase: Chromosomes move
apart to opposite sides of the cell.
Telophase: Chromosomes regroup
and begin to form two NEW nuclei.
The cell cycle is an on-going process.
The pictures below are “snapshots” of cells at
various stages of mitosis.
The cells will continue through the process and
repeat until they die.
Your turn….
Cell Cycle Video...
Glue at the top of
page 46
CELL CYCLE: series of events that cells
go through to grow and divide
• The cell cycle is used for the growth and
repair of organisms.
• Made up of two main sections: Interphase &
Mitosis
INTERPHASE:
• Majority of a
cell’s life
• Includes 3 phases
(G1, S, G2)
G1 phase: grow, make proteins,
make new organelles
Label the G1 phase on your diagram:
G1 phase
S phase:
DNA is
replicated;
longest part
of
interphase
Label the S phase on your diagram:
G1 phase
S
phase
Reminder…
WHY does the DNA have to
replicate before the cell divides?
G2 phase:
organelles &
proteins required
for division are
produced
When G2 is complete, the
cell is ready to divide.
Label the G2 phase on your diagram:
G1 phase
S
phase
G2 phase
Checkpoints:
points when the cell checks for problems
Sometimes the cell has
problems it can’t fix.
Problems in the cell
cycle can lead to
cancer.
We’ll talk about that
more next week.
Label the checkpoints on your diagram:
G1
phase
✔ DNA damaged?
Cell big enough?
All chromosomes
aligned?
✔
S
phase
G2
phase
✔
DNA replicated?
Cell big enough?
DNA damaged?
CELL DIVISION: process where a cell grows and
divides into TWO identical daughter cells
The last two parts of the cell cycle are
M phase (mitosis)
and
Cytokinesis
MITOSIS (M phase):
division of the cell’s
nucleus
*divided into FOUR PHASES:
prophase,
metaphase,
anaphase, and
telophase
*PMAT*
PROPHASE: chromosomes become visible, the
centrioles separate to opposite sides of the cell, the
chromosomes attach to the spindle, the nucleolus
disappears, nuclear envelope breaks down
DRAW THIS!
The centrioles are
two tiny structures
located in the
cytoplasm that help
organize the
spindle.
The spindle is a
fanlike microtubule
structure that helps
separate the
chromosomes.
METAPHASE:
chromosomes line
up along the
equator (center) of
the cell
DRAW THIS!
ANAPHASE: the centromeres
joining the sister chromatids
split; chromosomes move away
to opposite sides of the cell,
near the poles of the spindle.
TELOPHASE: chromosomes begin to disperse; nuclear
envelopes reappear to form two new nuclei
(nuclei = more than 1 nucleus)
Cell division is not complete after telophase! Then comes…
CYTOKINESIS: division of the cytoplasm;
two identical cells are produced
• Fold your paper windowpane style (writing on the
inside).
• Write Interphase on the
left and Mitosis on the
right.