The Cell Cycle. DNA wraps itself around proteins DNA + protein is called Chromatin As chromatin condenses… DNA has a Double helix shape visible under.

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Presentation transcript:

The Cell Cycle

DNA wraps itself around proteins DNA + protein is called Chromatin As chromatin condenses… DNA has a Double helix shape visible under a light microscope. it becomes This is a naked strand of DNA Visible, compact chromatin makes up a Chromosome

This is another look at how DNA is packaged. Naked DNA Chromatin Supercoils Chromosome

Centrioles Centrosome Centromeres The three C’s that might confuse you.

Interphase

Replicates Centrosomes DNA Chromatin forms supercoils (“S” stage) Cell membrane Cytoplasm The Cell in Interphase (“G 2 ” stage) Nucleolus Nucleus “G 1 ” stage

Mitotic Phase

MITOSIS

The Cell in Early Prophase Chromatin condenses Chromosomes become visible Nucleolus disappears

Nuclear envelope breaks down Centrosomes move apart Spindle fibers form The Cell in Late Prophase

METAPHASE Chromosomes align in middle of the cell Spindle fibers attach to centromeres

METAPHASE Under the microscope, chromosomes may appear flat. In the cell however, chromosomes have a three-dimensional arrangement.

ANAPHASE “Free” spindle fibers lengthen; cell elongates Sister Chromatids separate and move apart Spindle microtubules disintegrate behind chromatids

TELOPHASE Daughter chromosomes reach centrosomes

CYTOKINESIS Cell divides into two identical daughter cells Nuclear membrane reforms TELOPHASE Mitotic spindle disappears Nucleoli reappear

CYTOKINESIS INTERPHASE New daughter cells

Mitosis Animated Click through the next 30 slides to see a rough animation of the cell cycle.

The Cell in Interphase 1

Interphase 2

3

4

5

6

7

Prophase 8

9

10

Prophase 11

Metaphase 12

Metaphase 13

Metaphase 14

Anaphase 15

Anaphase 16

Anaphase 17

Anaphase 18

Telophase 19

Telophase 20

Telophase Cytokinesis 21

Telophase Cytokinesis 22

Telophase Cytokinesis 23

Telophase Cytokinesis 24

Telophase Cytokinesis 25

Daughter Cells 26

Daughter Cells 27

Daughter cells 28

Interphase 29

Interphase 30

MITOTIC EVENTS PRACTICE IDENTIFY THE MITOTIC EVENTS IN THE SLIDES WHICH FOLLOW

What mitotic event is shown? Answer: Anaphase

What mitotic event is shown? Answer: Prophase

What mitotic event is shown? Answer: Telophase

What mitotic event is shown? Answer: Metaphase

Cell Cycle Organizer Cell Cycle Interphase Mitotic Phase Mitosis Cytokinesis Prophase G1G1 S G2G2 Telophase Metaphase Anaphase

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