The differences between plant and
animal cells
1
1
Chromosomes are copied (# doubles)
• All organelles and cytoplasm double
• Chromosomes appear as long thin threadlike
coils (chromatin)
•
Nucleus
Cell
Membrane
Cytoplasm
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Centrioles (or poles) appear
• Spindle fibers form near centrioles.
• Centromeres appear, hold chromosomes together
• Nuclear membrane begins to disappear
•
Chromosomes
Centrioles
Centromere
Spindle fibers
Animal Cell
Plant Cell
Spindle fibers
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
Chromosomes attach to the spindle fibers.
•
Chromosomes line up in center of cell
Chromosomes
Centromere
Centrioles
Spindle fibers
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
•
•
Centrioles tug on spindle fibers
Chromosomes separate and begin to move
to opposite ends of the cell.
Centromeres disappear
Centrioles
Spindle fibers
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Two new nuclei form.
• Spindle fibers and centrioles disappear.
• Mitosis ends.
•
Nuclear membrane
Chromosomes
Nuclear membrane
Chromosomes
Cytoplasm Divides
• Animal Cell - Cell membrane moves inward
• Plant Cell – Cell plate moves outward
Animal
Plant
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Animal Cell Division- Review
Interphase
Metaphase
Telophase
Prophase
Anaphase
Cytokinesis
Plant Cell Division- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Three reasons why cells
reproduce asexually:
Growth- needed so organisms can
develop
Repair- injured tissues
Replace – worn out cells
What type of cells never
leave interphase?
Muscle
Nerve
Skin cancer - the abnormal growth of skin cells most often develops on skin exposed to the sun.
How does it develop??
Cells that reproduce by asexual reproduction
reproduce constantly.
19
- Cell Division
20
20
http://www.cellsalive.com/mitosis.htm
How do little elephants grow up to be BIG
elephants?
The process of asexual
reproduction begins after a
sperm fertilizes an egg.
Animated Mitosis Cycle
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis