introduction to mitosis and meiosis
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Unit III Meiosis and Fertilization. Introduction to Mitosis and Meiosis . Biology is the only subject in which multiplication is the same thing as division …. MITOSIS: Making New Cells Making New DNA. Where it all began…. - PowerPoint PPT PresentationTRANSCRIPT
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Introduction to Mitosis and Meiosis
Unit III Meiosis and Fertilization
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Biology is the only subject in which multiplication is the same thing as division…
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MITOSIS:Making New CellsMaking New DNA
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Where it all began…You started as a cell smaller than a period at the end of a sentence…
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And now look at you…
How did you get from there to here?
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Going from egg to baby…. the original fertilized egg has to divide…
and divide…and divide…
and divide…
Getting from there to here…
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Why do cells divide… One-celled organisms
for reproduction asexual reproduction (clones)
Multi-celled organisms for growth & development
from fertilized egg to adult for repair & replacement
replace cells that die from normal wear & tear or from injury
amoeba
starfish
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Dividing cells… What has to be copied
DNA organelles cell membrane lots of other
molecules▪ enzymes
animal cellplant cell
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double-strandedhuman chromosomesready for mitosis
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Chromosomes of Human Female
46 chromosomes23 pairs
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Chromosomes of Human Male
46 chromosomes23 pairs
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THINK-PAIR-SHARE
THINK ( 3 minutes)-> write 5 things
PAIR ( 2 minutes )-> share 2 things with your partner write what your partner said
SHARE ( 2 minutes)-> share 1 thing with the class write what the class shared
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STEPS OF MITOSIS
i p
M A T
C
I.P.M.A.T.C.
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Mitosis: Dividing DNA & cells
Stage 1: cell copies DNA
nucleus
cell
DNA Copy DNA!
(interphase)
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Mitosis: Dividing DNA & cells
Stage 2: DNA winds into chromosomes DNA is wound up into chromosomes to
keep it organized
nucleus
cell
duplicated chromosomes Wind up!
(prophase)
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Mitosis: Dividing DNA & cells
Stage 3: Chromosomes line up chromosomes line up in middle attached to protein “cables” that will
help them move
duplicated chromosomeslined up in middle of cell
Line up!
(metaphase)
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Mitosis: Dividing DNA & cells
Stage 4: Chromosomes separate chromosomes split, separating pairs start moving to opposite ends
chromosomes split & move to opposite ends
Separate!
(anaphase)
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Mitosis: Dividing DNA & cells
Stage 5: Cell starts to divide cells start to divide nucleus forms again
Divide!
(telophase)
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Mitosis: Dividing DNA & cells
Stage 6: DNA unwinds again cells separate now they can do their every day jobs
Bye Bye!
(cytokinesis)
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New “daughter” cells Get 2 exact copies of original cells
same DNA “clones”
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Cell division in Animals
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Mitosis in whitefish embryo
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Mitosis in plant cell
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onion root tip
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Overview of mitosis
interphase prophase
metaphase anaphase telophase
cytokinesis
I.P.M.A.T.C.
Please Make Another Two Cells