cell reproduction1.ppt
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Cell Reproduction
● Prokaryotes
Bacteria●
EukaryotesPlants & animals
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Prokaryotes
● Lack a nucleus● Have a single chromosome● Reproduce by binary fission
● Include bacteria
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Steps in Binary Fission
● Used by bacteria● ells increase their
cell mass slightly ● !"# & cell
components are
replicated ● Each cell divides into
$ 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
Remember !P"#$C● Interphase
● % Phase
● ' Phase
● %$ Phase
● (itoisis Phase● Prophase
● (etphase
● #naphase● )elophase
● ytokinesis
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!nterp%ase
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&' P%ase
●
First growth stage● Cell increases in size● Cell prepares to copy its DNA
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Synt%esis P%ase
●
Copying of all of DNA’sinstructions● Chromosomes duplicated
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&( P%ase
●
Time between DNA synthesis& mitosis● Cell continues growing● Needed proteins produced
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Stages of "itosis
●
Prophase● (etaphase● #naphase● )elophase
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Cells )ndergoing "itosis
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Steps in Prop%ase
● DNA coils tightly &
becomes isible as
chromosomes● Nuclear membrane
disappears●
Centrioles migrate to poles● !pindle begins to form
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"itosis Dividing D*# + cells
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nucleu
s
cell
duplicated chromosomes
Thin"# $ for
$ac"ed DNA%%%
prophase
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Prop%ase
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Eukaryotic C%romosome
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,uman C%romosomes
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"etap%ase
$%ink " for "iddle-●!pindle fibers from centrioles attach to eachchromosome
●chromosomes line up on the metaphase plate
●attached to protein “cables” that will help them
move
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duplicated chromosomes
lined up in middle of cell
(ine
up%
metaphase
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"etap%ase
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#nap%ase
$%ink # stands for split apart/●Stage 4: Chromosomes separate●chromosomes split, separating pairs
●start moving to opposite ends
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chromosomes split &
moe to opposite ends
!eparate%
anaphase
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"itotic Spindle
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#nap%ase
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Steps in $elop%ase
● !eparation of chromosomes
completed● Cell $late forms plants'● Cleaage furrow formsanimals'
● Nucleus & nucleolus reform● Chromosomes uncoil
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$elop%ase
$%ink $ for tig%t/ on eac% pole-●cells start to divide●Cell $late forms plants'
●Cleaage furrow formsanimals
●nucleus forms again
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Diide%
telophase
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$elop%ase
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$lant Animalcopyright cmassengale
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Cytokinesis
●cells separate
●Two identical daughter cells
●now they can do their every day jobs
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)ye )ye%
cyto"inesis
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Cytokinesis
Cell $late Forming in $lant Cells
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*e0 daug%ter/ cells
●et ! e"act copies of original cells●same #$%
●“clones”
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Cell division in #nimals
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"itosis in 0%itefis% embryo
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"itosis in plant cell
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I PMATC
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1vervie0 of mitosis
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interphase prophase
metaphase h
cyto"inesis
I.P.M.A.T.C
.
Please Ma"e Another Two Cells
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