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Cellular Division
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Boy or Girl?

Y - Chromosome

X - Chromosome

The Y Chromosome Decides

Slide 14

Cell Reproduction

Cell Reproduction

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Types of Cell Reproduction

Types of Cell Reproduction

Asexual reproduction involves a single cell dividing to make 2 new, identical daughter cells

Mitosis & binary fission are examples of asexual reproduction

Sexual reproduction involves two cells (egg & sperm) joining to make a new cell (zygote) that is NOT identical to the original cells

Meiosis is an example

Slide 16

Cell Division in Prokaryotes

Cell Division in Prokaryotes

Slide 17

Cell Division in Prokaryotes

Cell Division in Prokaryotes

Prokaryotes such as bacteria divide into 2 identical cells by the process of binary fission

Single chromosome makes a copy of itself

Cell wall forms between the chromosomes dividing the cell

Parent cell

2 identical daughter cells

Chromosome replicates

Cell splits

Slide 18

Prokaryotic Cell Undergoing Binary Fission

Prokaryotic Cell Undergoing Binary Fission

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Animation of Binary Fission

Animation of Binary Fission

Slide 20

The Cell Cycle

The Cell Cycle

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Five Phases of the Cell Cycle

Five Phases of the Cell Cycle

G1 - primary growth phase

S – synthesis; DNA replicated

G2 - secondary growth phase

collectively these 3 stages are called interphase

M - mitosis

C - cytokinesis

Slide 22

Cell Cycle

Cell Cycle

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Interphase - G1 Stage

Interphase - G1 Stage

1st growth stage after cell division

Cells mature by making more cytoplasm & organelles

Cell carries on its normal metabolic activities

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Interphase – S Stage

Interphase – S Stage

Synthesis stage

DNA is copied or replicated

Two identical copies of DNA

Original DNA

Slide 25

Interphase – G2 Stage

Interphase – G2 Stage

2nd Growth Stage

Occurs after DNA has been copied

All cell structures needed for division are made (e.g. centrioles)

Both organelles & proteins are synthesized

Slide 26

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