Transcript S or Synthesis stage, this is where the DNA replicates in the cell On

Interphase
Prophase
Metaphase
Anaphase
Telophase
Misc.
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When does interphase occur?
• It is the first and longest phase of a cells life
cycle
What types of cells never leave
interphase (2 types)?
• Nerve and brain cells
What is the first stage of interphase
and what occurs here?
• G1 is the first stage, it is here that the cell
grows and replicates its organelles
What is the second stage of
interphase and what occurs here?
• S or Synthesis stage, this is where the DNA
replicates in the cell
On the board, draw the diagram of
a cells life cycle. Make sure to
label every stage.
When does prophase occur?
• Prophase occurs immediately after G2 of
interphase
What type of cell contains centrioles?
• Animal cells only!
Describe 2 things that happen
during prophase.
• Nuclear membrane starts to disappear
• Chromatin shortens & thickens into visible
chromosomes
• Centrioles move to opposite ends of the cell
• Spindle fibers begin to form
Draw on the board what a
chromosome looks like in prophase,
make sure to label the parts.
How does the shape of a nerve cell
help it’s surface area to volume
ratio? .
If you get a mutation in the DNA of
a liver cell, would your children
get that gene?
•
• No, since it wasn’t in a sex cell (egg or
sperm)
Describe 2 things that happens
during metaphase.
• Chromosomes line up along the equator
• Chromosomes attach to spindle fibers at the
centromeres. (Spindle fibers begin to
shorten)
What stage is this?
• prophase
What stage is this?
• telophase
What form is the DNA in when it
lines up in the middle of the cell?
• Chromosomes
On the board draw a diagram of an
animal cell in metaphase. Make sure
to label everything!
When does anaphase occur?
• Immediately after metaphase
What type of cell division can produce a new
organism
a) asexual
b) sexual
c) both?
• both
Describe 2 things that happen
during anaphase
• Chromatids separate and move toward the poles of the
cell (go from double armed  single armed)
• Spindle fibers are shortening
• Phase ends when chromatids reach the poles
Chromatids separate at what part of
the chromosome during anaphase?
• Centromere
Mitosis
Meiosis
Multicellular organisms use
______to make new body
cells but use _________ to
make the sex cells for making
a new organism
When does telophase occur?
• Immediately after anaphase
What form is DNA in during this
phase?
• When it gets to the poles it is chromatid, but
quickly goes to chromatin
Describe 2 things that happen
during telophase.
• Spindle fibers disappear
• Nuclear membrane reforms
• Cytoplasm divides at the equator (cell plate)
What is cytokinesis and describe
how it occurs in a PLANT and
ANIMAL cell.
• Division of the cytoplasm
• Animals- cleavage furrow and cytoplasm
divides
• Plants- cell plate forms in between the two
nuclei
On the board draw a diagram of
an animal cell in telophase. Make
sure to label everything!
Define parent cell.
• The first cell that divides
What are the two types of
reproduction that cells undergo?
• Asexual
• Sexual
Why is an elephant bigger than a
human?
• It has more cells!
•
What is a somatic cell, give an
example.
It is a cell with a complete set of
chromosomes (2n)
• Examples: skin cells, hair cells- any cell that
is not a reproductive cell(n)
How many chromosomes do you
have in your somatic cells?
• 46