cell reproduction1.ppt

8/17/2019 Cell Reproduction1.Ppt

1/34

Cell Reproduction

● Prokaryotes

Bacteria●

EukaryotesPlants & animals

copyright cmassengale copyright cmassengale


2/34

Prokaryotes

● Lack a nucleus● Have a single chromosome● Reproduce by binary fission

● Include bacteria

copyright cmassengale



3/34

Steps in Binary Fission

● Used by bacteria● ells increase their

cell mass slightly ● !"# & cell

components are

replicated ● Each cell divides into

$ daughter cells



4/34

Binary Fission of Bacterial

Cell




5/34

E. Coli Dividing by Binary

Fission




6/34

Eukaryotes

●

Contain a nucleus &membrane bound organelles● Asexually reproduce cells by

mitosis




7/34

Cell Cycle

Remember !P"#$C● Interphase

● % Phase

● ' Phase

● %$ Phase

● (itoisis Phase● Prophase

● (etphase

● #naphase● )elophase

● ytokinesis



8/34


!nterp%ase



9/34

&' P%ase

●

First growth stage● Cell increases in size● Cell prepares to copy its DNA




10/34

Synt%esis P%ase

●

Copying of all of DNA’sinstructions● Chromosomes duplicated




11/34

&( P%ase

●

Time between DNA synthesis& mitosis● Cell continues growing● Needed proteins produced




12/34

Stages of "itosis

●

Prophase● (etaphase● #naphase● )elophase




13/34

Cells )ndergoing "itosis



14/34

Steps in Prop%ase

● DNA coils tightly &

becomes isible as

chromosomes● Nuclear membrane

disappears●

Centrioles migrate to poles● !pindle begins to form




15/34

"itosis Dividing D*# + cells


nucleu

s

cell

duplicated chromosomes

Thin"# $ for

$ac"ed DNA%%%

prophase


16/34

Prop%ase



17/34

Eukaryotic C%romosome



18/34

,uman C%romosomes



19/34

"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


duplicated chromosomes

lined up in middle of cell

(ine

up%

metaphase


20/34


"etap%ase



21/34

#nap%ase

$%ink # stands for split apart/●Stage 4: Chromosomes separate●chromosomes split, separating pairs

●start moving to opposite ends


chromosomes split &

moe to opposite ends

!eparate%

anaphase


22/34

"itotic Spindle



23/34


#nap%ase



24/34

Steps in $elop%ase

● !eparation of chromosomes

completed● Cell $late forms plants'● Cleaage furrow formsanimals'

● Nucleus & nucleolus reform● Chromosomes uncoil




25/34

$elop%ase

$%ink $ for tig%t/ on eac% pole-●cells start to divide●Cell $late forms plants'

●Cleaage furrow formsanimals

●nucleus forms again


Diide%

telophase


26/34

$elop%ase


$lant Animalcopyright cmassengale


27/34

Cytokinesis

●cells separate

●Two identical daughter cells

●now they can do their every day jobs


)ye )ye%

cyto"inesis


28/34

Cytokinesis

Cell $late Forming in $lant Cells


29/34

*e0 daug%ter/ cells

●et ! e"act copies of original cells●same #$%

●“clones”



30/34

Cell division in #nimals



31/34

"itosis in 0%itefis% embryo



32/34

"itosis in plant cell



33/34

I PMATC


34/34

1vervie0 of mitosis


interphase prophase

metaphase h

cyto"inesis

I.P.M.A.T.C

.

Please Ma"e Another Two Cells

cell reproduction1.ppt

Documents