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http://www.simpletruths.tv/store/movies.php?movie=fstr. Lesson 14b: Mitosis. Biology is the only subject in which multiplication is the same thing as division …. Making New Cells Making New DNA. Where it all began…. You start as a cell smaller than a period at the end of a sentence….

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Simpletruths store movies php movie fstr

http://www.simpletruths.tv/store/movies.php?movie=fstr


Biology is the only subject in which multiplication is the same thing as division

Lesson 14b: Mitosis

Biology is the only subject in which multiplication is the same thing as division…


Making new cells making new dna

Making New CellsMaking New DNA


Where it all began

Where it all began…

You start as a cell smaller than a period at the end of a sentence…

And end up as a full grown adult with billions of cells!


Getting from there to here

Getting from there to here…

  • Going from egg to baby….

    the original fertilized egg has to divide…

    and divide…

    and divide…

    and divide…


Why do cells divide

Why do cells divide…

  • for reproduction

    • one celled organisms (clones)

  • for growth & development

    • fromfertilized eggto multi-celled organism

  • for repair

    • replace cells that

      die or are lost

amoeba


The cell cycle

The Cell Cycle

G1 = Resting and Growth

S = DNA is replicated

G2 = Growth & Prep

for Mitosis

M = Mitosis (cell division)


Dividing cells

Dividing cells…

  • What has to be copied

    • DNA

    • organelles

    • cell membrane

    • lots of othermolecules

      • enzymes

plant cell

animal cell


Remember this

Coil DNA into compact chromosomes

Copying DNA

Remember this?

  • When a cell is ready to divide it must…

    • copy DNA first (DNA Replication), then…

    • coil up doubled chromosomes like thread on a spool…

      • now can move DNA around cell without having it tangle & break


Copied paired up chromosomes

Copied & Paired Up Chromosomes

Single DNA strand

Single DNA strand being duplicated

centromere

Two new DNA strands linked by centromere

making one doubled chromosome.


Cell prepares to divide

DNA in chromosomes

cell

nucleus

cell

duplicated chromosomes

nucleus

Cell Prepares to Divide

chromosomes are duplicated

Centromeres link chromosomes

4 single-stranded chromosomes

4 duplicated chromosomes


Mitosis dividing dna cells

Mitosis: Dividing DNA & Cells

  • Stage 1: DNA Replication occurs.

DNA

DNA is copied!

cell

nucleus

INTERPHASE


Mitosis dividing dna cells1

Mitosis: Dividing DNA & cells

  • Stage 2: DNA winds into chromosomes

Chromosomes are condensed!

duplicated chromosomes

cell

PROPHASE

nucleus


Mitosis dividing dna cells2

Mitosis: Dividing DNA & cells

  • Stage 3: Chromosomes line up in middle

    • attached to protein spindle fibers that will pull them apart.

Chromosomes

are lined up!

METAPHASE


Mitosis dividing dna cells3

Mitosis: Dividing DNA & cells

  • Stage 4: Chromosomes separate

    • chromosomes split, separating the pairs

    • start moving to opposite ends (poles)

Chromosomesare separated!

ANAPHASE


Mitosis dividing dna cells4

Mitosis: Dividing DNA & cells

  • Stage 5: Cytokinesis

    • cells start to divide

    • nucleus forms again

Cells Divide!

TELOPHASE


New daughter cell clones

New “daughter” cell CLONES

  • Get 2 exact copies of original cells

    • same DNA

    • “clones”


Mitosis in whitefish embryo

Mitosis in whitefish embryo


Mitosis in plant cell

Mitosis in plant cell


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onion root tip

http://www.cellsalive.com/mitosis.htm


Overview of mitosis

Overview of mitosis


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Any Questions??

Any Questions??

Virtual Lab 8 Mitosis in Plant Cells

Virtual Lab 9 Comparing Mitosis in Plant and Animal Cells

Draw, label and explain mitosis as shown on pages 246-247 in your text.


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