Boy or Girl?
Y - Chromosome
X - Chromosome
The Y Chromosome Decides
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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
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Cell Division in Prokaryotes
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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
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Prokaryotic Cell Undergoing Binary Fission
Slide 19
Animation of Binary Fission
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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
Slide 23
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
Synthesis stage
DNA is copied or replicated
Two identical copies of DNA
Original DNA
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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
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