“Cell division is part of the cell cycle” Section 3.2 & 3.3.
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Transcript of “Cell division is part of the cell cycle” Section 3.2 & 3.3.
Objectives
• Describe the main events of the cell cycle
• Differentiate interphase from mitosis
• Construct a cell cycle model from paper plates.
Cell Cycle• “normal sequence of development and division of a cell”
• Two main phases: Interphase & M-phase (Mitosis)
Interphase• There is no division in interphase, just
growth.
G1: organelles duplicate, cell grows
S: DNA replicates (is copied)
G2: cell grows, prepares to divide
M-phase (Mitosis)• Mitosis= “nuclear division”
• PMAT+ C• Prophase• Metaphase• Anaphase• Telophase• Cyokinesis
Plate Models• You are now going to make a study
tool using paper plates.
• Follow along while I show you how to fold the plate, use the directions as a guide.
• Pass out plates
Prophase• DNA condenses to form chromosomes.
• Each chromosome has 2 chromatids and a centromere
• The nuclear membrane disappears
Anaphase – “away”
• Chromatids split• Spindles pull to opposite sides of the
cell AWAY from each other
Telophase• 2 Nuclei form• Nuclear membrane
forms around each group of chromosomes.
• The chromosomes become chromatin again.
Cytokinesis
• Division of the cytoplasm.
• Occurs differently in plant and animal cells.
• 2 New daughter cells!
Cytokinesis
• Animal Cells:• Membrane pinches
together and forms a cleavage furrow until the cells separate.
Section 3.3
• Eukaryotic cells divide by mitosis and cytokinesis.
• Ex: skin cells apart of skin tissue (aren’t independent)
• Most unicellular organisms use cell division to reproduce through asexual reproduction.
• Asexual Reproduction: one organisms produces one or more new organisms that are identical to itself and that live independently of it
“Both sexual and asexual
reproduction involve cell
division”
Binary Fission
• A form of asexual reproduction occurring in prokaryotes.
• The parent organism splits in two, creating two independent daughter cells.
• Genetically all the same!
Budding - Organism develops tiny buds on
its body.
• Genetic material the same!
• Can bud anywhere OR specialized cells in certain parts of the body.
• Detaches when it reaches a certain size
• Both unicellular and multicellular can reproduce by budding.
Hydra