Download Lesson 34 - Science with Mr Thompson

Lesson 118
Learning Goal: (You should be able to…)
Explain how a single cell (Zygote) can develop into a
complex 30 trillion differentiated cellular organism
(human). : (Can you …)
Describe binary fission
Describe the cell cycle by:
completing the diagram
completing the GO
In your binder
lesson 118
Brief description of binary fission??
Cell Cycle GO’S … diagram(s) and summarizer(s)
Answers to questions on google classroom … Today,
Thursday and Friday.
Self directed.
PSR and content!!
Due on Monday 15th at 6:00am: Homework??
WED: HS and SLC org
FRI; ??
Essential Questions
1.How do living organisms pass
on their traits?
2.How do the laws of genetics
help predict the possible
expression of certain traits?
3.How do malfunctions affect
the system of inheritance?
Cell cycle Vocabulary
Zygote and cell cycle
Interphase:G1 phase, S phase, G2 phase,( G0 phase)
Mitosis and the 4 phases (PMAT)
Cytokinesis
DNA and replication
Chromosome, Gene
Karyotype
Write to Think 118
Need my signature for Hons. Bio?
Place your form on the corner of your lab
bench NOW!
1.
2.
3.
Why do cells make an exact copy of their DNA in
S phase?
What is mitosis?
What terms have you come across so far that
are closely associated with the term DNA?
Plan of action/To do …
• Follow the instructions and start to answer questions in google
classroom “cell cycle”.
• Try to get up to number 17 or 18 today! Do what you can …
leave out what you can’t.
• Miss out number 3!
• Use texts, text book pages 55 to 62 and Internet
• Some URL’s provided …. But there are LOTS more!
• REM: You wont find ‘answers’ all in one place. Add to each
organizer and google classroom as you discover more
information.
• Today and Monday.
• Homework? (Hons Bio students?)
• Due by Tuesday 6:00am.
• Why are you doing this? Why do you care?
Cell cycle animation
• http://www.cellsalive.com/mitosis_js.htm
Animation
• http://highered.mcgrawhill.com/sites/0072495855/student_view0/ch
apter2/animation__how_the_cell_cycle_work
s.html
Mitosis.mpg
Fig. 12-5
G1
S
(DNA synthesis)
G2
Summarizer
Can you list the phases of the cell cycle in order
without looking?
Can you describe what happens in detail during
each stage of mitosis?
Can you explain why each stage of mitosis occurs?
End of Lesson
Cell cycle and Mitosis
Eukaryotes divide by a more complicated system called Mitosis
This is because:
They have a nucleus which must be broken up and then
reformed
They have their DNA “packaged” in the form of
Chromosomes
Chromosomes are composed of Chromatin
Made of DNA Strands & Proteins
They usually have more than 1 chromosome (Humans have
46 chromosomes)
Binary Fission
• Cells reproduce through
some sort of Cell Division
• Prokaryotic cells divide
through a simple form called
Binary Fission
• 3 step process
• DNA forms a duplicate of
itself.
• The two IDENTICAL copies
move to opposite ends of the
prokaryotic cell
• The cell “pinches” into two
new genetically identical cells
called "daughter cells".
Cell Cycle and Mitosis
• Eukaryotic cells reproduce by a process called the
cell cycle
• It is designed so the organism can grow and repair
itself.
• It produces TWO copies from ONE original cell.
• Two new daughter cells are made and no original
cell is left!
• The Two new daughter cells have EXACTLY the
same DNA: They are Genetically identical.
• MUTATIONS (change in DNA) shouldn’t occur BUT
they might … mistakes happen!
Fig. 12-1