Transcript Do Now - TeacherWeb

Do Now: Why do skin cells need to be constantly replaced?
Explain how you think the pumpkin grew so big from a
small flower.
DNA
Chromatin
Chromosomes
Chromatids
Which # is DNA?
2. Which # has sister chromatids?
3. What is happening in these pictures?
1.
Cell Cycle
Human Life Cycle
Do Now: What is happening in this cartoon?
Do Now: Compare these two cycles.
Human Life Cycle
Cell Cycle
Stages
1. Interphase
2. Mitosis
• Prophase
• Metaphase
• Anaphase
• Telophase
3. Cytokinesis
Phases
Study Help……
Stages
1. Interphase
2. Mitosis
• Prophase (Pieces)
• Metaphase (Middle)
• Anaphase (Apart)
• Telophase (Two)
3. Cytokinesis
The Cell Cycle
Stage One: Interphase
• Longest stage
• Cell grows to its mature size, makes a copy of its DNA (replication),
and prepares to divide.
Phases of Mitosis
Prophase
• Chromatin condenses and becomes fully visible
• Nuclear membrane disappears
• Centrioles move to opposite ends of the cell
• Spindle fibers stretch across the cell
Prophase
(Hint: Pieces)
Phases of Mitosis
Metaphase
• Chromosomes line up
• Centromeres become attached to spindle fibers
Metaphase
(Hint: Middle)
Phases of Mitosis
Anaphase
• Chromatids separate and move away from each other to
opposite ends of the cell
Anaphase
(Hint: Apart)
Phases of Mitosis
Telophase
• A nuclear membrane forms around each mass of chromosomes
Telophase
(Hint: Two)
The Cell Cycle
Stage Three: Cytokinesis
• Cytoplasm divides
• Each daughter cell has the same number of chromosomes as the
original parent cell
Do Now: What is the longest part of the Cell Cycle and why?
How are plant cells different from animal cells?
How are plant cells different from animal cells?
The rigid cell wall will not allow the cell to pinch like an animal cell.
How are plant cells different from animal cells?
• The rigid cell wall will not allow the cell to pinch like an animal cell.
How are plant cells different from animal cells?
• The rigid cell wall will not allow the cell to pinch like an animal cell.
• Plant cells form cell plates to divide the cell.
How are plant cells different from animal cells?
The rigid cell wall will not allow the cell to pinch like an animal
cell.
• Plant cells form cell plates to divide the cell.
• Plant cells do not have centrioles.
•
Complete the Venn Diagram
How is mitosis different in plant and anima cells?
Do Now: What phases can you see here?
Do Now: Identify these phases of Mitosis?
Do Now: Draw the following diagram. What is happening in this
picture? How is this connected to the Cell Cycle.
Binary Fission
Binary fission produces
daughter cells with DNA
identical to the parent. It is a
way for protozoa to increase in
number when environmental
conditions are stable. When
environmental conditions
change, the protozoa
reproduce, because combining
DNA from two organisms allows
more genetic variation and
more options for survival in a
changing environment.
Regeneration
When an organism is
able to regrow part of
their organism or most
of an organism from
just a section. A part
of the nervous system
must be included for
regeneration to occur.
In such an organisms
cells are able to
differentiate (change
into cells of different
function).
Regeneration
Regeneration
BUDDING
A form of asexual
reproduction in living
organisms in which new
individuals form from
outgrowths (buds) on the
bodies of mature organisms.
These outgrowths grow by
means of mitotic cell
division. Many simple
multicellular animals such as
hydras and unicellular
organisms such as yeasts
reproduce by budding.
BUDDING
Equal division
of the nucleus,
unequal
division of the
cytoplasm
BUDDING
BUDDING
Reproduction
Sexual Reproduction: sex cells from two parents combine
Egg + Sperm = Zygote (cell that forms in fertilization)
Fertilization: the joining of an egg and sperm
Asexual Reproduction: independent of the sexual process
1. Regeneration – a new organism grows from just a part of
the parent organism (re-grow a body part)
Ex. lizard and starfish
Yeast
Sponge
Reproduction
Sexual Reproduction: sex cells from two parents combine
Egg + Sperm = Zygote (cell that forms in fertilization)
Fertilization: the joining of an egg and sperm
Asexual Reproduction: independent of the sexual process
1. Regeneration – a new organism grows from just a part of
the parent organism (re-grow a body part)
Ex. lizard and starfish
2. Budding – new offspring grows on the parent
Ex. Yeast, sponge and hydra
Reproduction
Sexual Reproduction: sex cells from two parents combine
Egg + Sperm = Zygote (cell that forms in fertilization)
Fertilization: the joining of an egg and sperm
Asexual Reproduction: independent of the sexual process
1. Regeneration – a new organism grows from just a part of
the parent organism (re-grow a body part)
Ex. lizard and starfish
2. Budding – new offspring grows on the parent
Ex. Yeast, sponge and hydra
3. Fission – to split in two
Ex. bacteria, sea anemone
Do Now: Label the phases.