cell reproduction
DESCRIPTION
This slideshow talks about Cellular Reproduction in Prokaryotes (Binary Fission) and in Eukaryotes (Mitosis)TRANSCRIPT
Cell Reproduction
ProkaryotesBacteria
EukaryotesPlants &
animals
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Prokaryotes
Lack a nucleus Have a single chromosomeReproduce by binary fission Include bacteria
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Steps in Binary Fission
Used by bacteria Cells increase
their cell mass slightly
DNA & cell components are replicated
Each cell divides into 2 daughter cells
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Binary Fission of Bacterial Cell
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E. Coli Dividing by Binary Fission
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Eukaryotes
Contain a nucleus & membrane bound organelles
Asexually reproduce cells by mitosis
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Cell Cycle
Stages in growth & division
G1 Phase S Phase G2 Phase M Phase Cytokinesis
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G1 Phase
First growth stageCell increases in sizeCell prepares to copy its DNA
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Synthesis Phase
Copying of all of DNA’s instructions
Chromosomes duplicated
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G2 Phase
Time between DNA synthesis & mitosis
Cell continues growingNeeded proteins produced
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M Phase
Cell growth & protein production stop
Cell’s energy used to make 2 daughter cells
Called mitosis
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Interphase – Resting Stage
Cells carrying on normal activities
Chromosomes aren’t visibleCell metabolism is
occurringOccurs before mitosis
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Interphase
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Stages of Mitosis
ProphaseMetaphaseAnaphaseTelophase
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Cells Undergoing Mitosis
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Steps in Prophase
DNA coils tightly & becomes visible as chromosomes
Nuclear membrane disappears Nuceolus disappears Centrioles migrate to poles Spindle begins to form
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Prophase
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Eukaryotic Chromosome
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Human Chromosomes
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Steps in Metaphase
Spindle fibers from centrioles attach to each chromosome
Cell preparing to separate its chromosomes
Cell aligns its chromosomes in the middle of the cell
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Metaphase
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Steps in Anaphase
Cell chromosomes are separated
Spindle fibers shorten so chromosomes pulled to ends of cell
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Mitotic Spindle
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Anaphase
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Steps in Telophase
Separation of chromosomes completed
Cell Plate forms (plants)Cleavage furrow
forms(animals)Nucleus & nucleolus reformChromosomes uncoil
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Telophase
Plant Animalcopyright cmassengale
Cytokinesis
Occurs after chromosomes separate
Forms two, identical daughter cells
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