mitosis study guide answers
TRANSCRIPT
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Mitosis Study
GuideReview
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What is the purpose of
Mitosis?
Division of cells to grow, or
replace old, diseased, dead
or damaged body cells
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Explain each phase of the
cell cycle and draw a picture
of what a cell in this phase
might look like
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Interphase
Cell Grows
DNA is copied
Visible nucleus and nucleolus
DNA is uncondensed=chromatin
Chromosomes are NOT visible
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Interphase
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Prophase
Visible condensed double-stranded
chromosomes/ sister chromatids
Centrioles begin to send out spindle
fibers
Nuclear envelope disappears
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Prophase
Plant Cell Animal Cell
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Metaphase
Double-stranded chromosomes/ Sister
chromatids line up in the center of the
cell
Spindle fibers connect to the
centromeres of each chromosome
Chromatids are being pulled
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Metaphase
Plant Cell Animal Cell
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Anaphase
Sister chromatids are moving apart=
chromatids once split
Chromatids are moving towards the
poles of the cell
Spindle fibers pull the chromatids to
the poles
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Anaphase
Plant Cell Animal Cell
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Telophase
New nuclear membrane begins to
form around each set of chromatids
Cytoplasm begins to divide
Chromatids uncoil= chromatin once
uncondensed
Visible cleavage furrow
Spindle fibers disappear
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Telophase
Plant Cell Animal Cell
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Cytokinesis
Cytoplasm divides
2 new daughter cells identical to the
parent cell
After cytokinesis, cell return to
interphase
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CytokinesisPlant Cell Animal Cell
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Explain what happens
to the cell’s genetic
information during the
following parts of the
cell cycle
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Interphase
DNA is copied
DNA is uncondensed=chromatin
Chromosomes are NOT visible
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Prophase
Visible condensed double-stranded
chromosomes/ sister chromatids
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Metaphase
Double-stranded chromosomes/ Sister
chromatids line up in the center of the
cell
Chromatids are being pulled
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Anaphase
Sister chromatids are moving apart=
chromatids once split
Chromatids are moving towards the
poles of the cell by means of the
spindle fibers
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Telophase
New nuclear membrane begins to
form around each set of chromatids
Chromatids uncoil= chromatin once
uncondensed
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Cytokinesis
2 new daughter cells
With identical DNA within each
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How do daughter cells produced
in mitosis compare to the original
cell?The daughter cells are identical to the
original (parent) cell.
Same function, same internal parts,
SAME DNA
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Explain the relationship that
mitosis has with cancer.Cancer is unregulated cell growth and
division.
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How do Chemotherapy drugs
used in cancer treatment affect
Mitosis?They stop cell division at various
stages of the cell cycle
◦ Prevent DNA replication (doxorubicin)
◦ Cross-link with DNA to prevent synthesis
(cyclophospliamide)
◦ Blocks cells from making nucleotides
(methotrexate)
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Why does chemotherapy tend to
cause side effects like hair loss
and gastrointestinal issues?They kill off the rapidly dividing cells
of the body
kill not only rapidly dividing cancer
cells but also cells of the rapidly
dividing cells like those that make up
hair, bone marrow, and the GI tract
Effects are NOT usually permanent
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What is the difference between a
scanning electron microscope
and a transmission electron
microscope?Scanning Electron Microscope
◦ The entire organism/specimen can be
used, but it must be coated in a thin layer
of gold atoms
◦ The imaged obtained is a 3 dimensional
surface image
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What is the difference between a
scanning electron microscope
and a transmission electron
microscope?Transmission Electron Microscope
◦ Uses a thin slice of an organism/specimen
◦ Used to study the internal make-up of the
specimen
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Scanning Electron Microscope
Images
Cat
Flea
Head
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Scanning Electron Microscope
Images
Hypodermic
Needle
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Scanning Electron Microscope
Images
Staple
Through
Paper
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Transmission Electron
Microscope Images
Cross Section
of a Sunflower
Plant Cell
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Transmission Electron
Microscope Images
Giardia
Cysts
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Transmission Electron
Microscope Images
Cross
Section of
Chloroplas
t in a Leaf
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How are the pictures they take
different?Scanning Electron Microscope Images
show…
◦ 3 dimensional images of surface
Transmission Electron Microscope
Images show…
◦ Internal make-up of the specimen (cross
section)
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What types of problems can
occur at each stage of the
Mitosis?Prophase: nuclear membrane may not dissolve causing the cell to not be able to go through other stages
Metaphase: Chromosomes may not line up, causing an error in the remaining phases
Anaphase: Sister chromatids may not split correctly, causing an error in the number of chromosomes at each cell pole
Telophase: Chromatids may not unravel, causing the chromatin not to be enclosed in the new nuclear membrane.
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What might happen to an
organism if their cells lost the
ability to divide via Mitosis?
Once that cell dies then that particular
cell would not be able to pass on their
DNA.
Furthermore, that particular organism
would not be able to make new cells after
the original parent cell has died
Eventually casing the death of that
particular organism