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5.2 Mitosis and Cytokinesis First Five 2/11 1.Write down the four phases for mitosis. 2.Pick up a colored pencil bag. Schedule 1.First Five 2.Mitosis Notes 3.Snapbeads HW: Mitosis Lab and quiz – Due Friday Mitosis/Cell Cycle/DNA – Due Tues 2/17 Test pkt and Test – Wed. 2/18 GQ: How does cell division work?
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5.2 Mitosis and Cytokinesis
First Five 2/71. Pick up your DNA bag and
sit with your partner.2. How does the structure of
DNA affect its function? (You must list 2 ideas)
Schedule1.First Five2.Mitosis Textbook Exercise/ Oral Quizzes3.Clean Up
HW: All Replication QuizzesMake-up Due Fri. 02/11
GQ: How is DNA replicated?
5.2 Mitosis and Cytokinesis
First Five 2/11
1. Why do cells need to reproduce or go through mitosis?
GQ: How do cells divide?
Schedule1.First Five2.Quiz and Mitosis Sheet3.Mitosis Snap-beads
5.2 Mitosis and Cytokinesis
First Five 2/111. Write down the four
phases for mitosis.2. Pick up a colored pencil
bag.
Schedule1.First Five2.Mitosis Notes3.SnapbeadsHW:Mitosis Lab and quiz – Due FridayMitosis/Cell Cycle/DNA – Due Tues 2/17Test pkt and Test – Wed. 2/18
GQ: How does cell division work?
5.2 Mitosis and Cytokinesis
KEY CONCEPT Cells divide during mitosis and cytokinesis.
5.2 Mitosis and Cytokinesis
5.2 Mitosis and Cytokinesis
Why do cells need to divide?1. Replace old and damaged cells2. Big cells begin to starve and lack Oxygen3. Big cells cannot get rid of waste or CO2 fast enough
5.2 Mitosis and Cytokinesis
Chromosomes condense at the start of mitosis.
• DNA wraps around proteins (histones) that condense it.
DNA doublehelix
DNA andhistones
Chromatin SupercoiledDNA
5.2 Mitosis and Cytokinesis
• DNA plus proteins is called chromatin.
• One half of a duplicated chromosome is a chromatid.
• Sister chromatids are held together at the centromere.
• Telomeres protect DNA and do not include genes.
Condensed, duplicated chromosome
chromatid telomere
centromere
telomere
5.2 Mitosis and Cytokinesis
Parent cell
centrioles
spindle fibers
centrosome
nucleus withDNA
• Interphase prepares the cell to divide.
• During interphase, the DNA is duplicated.
Mitosis and cytokinesis produce two genetically identical daughter cells.
5.2 Mitosis and Cytokinesis
• Mitosis divides the cell’s nucleus in four phases.– Prophase chromosomes condense and spindle
fibers form.
5.2 Mitosis and Cytokinesis
• Mitosis divides the cell’s nucleus in four phases.– Metaphase chromosomes line up in the middle of
the cell.
5.2 Mitosis and Cytokinesis
• Mitosis divides the cell’s nucleus in four phases.– Anaphase sister chromatids separate to
opposite sides of the cell.
5.2 Mitosis and Cytokinesis
• Mitosis divides the cell’s nucleus in four phases.– Telophase the new nuclei form and chromosomes
begin to uncoil.
5.2 Mitosis and Cytokinesis
• Cytokinesis differs in animal and plant cells.– In animal cells, the
membrane pinches closed.
– In plant cells, a cell plate forms.
5.2 Mitosis and Cytokinesis
Mitosis Videos• http://www.youtube.com/watch?v=pOsAbTi9tHw
5.2 Mitosis and Cytokinesis
First Five 2/101. Why do cells need to
divide? (Generate 2 reasons)
2. Check your grade.
Schedule1.First Five2.Notes Mitosis3.Mitosis SnapbeadsHW:DNA Replication Quiz – Due TomorrowTest/Test Packet – Due Thurs 2/13Review – Due Wednesday 2/12GQ: How does cell division work?
5.2 Mitosis and Cytokinesis
First Five 2/121. What is the form DNA
takes in Interphase?2. Take out your Review3. Pick up a snapbead bag
and colored pencil bin.
Schedule1.First Five2.Mitosis SnapbeadsHW:Mitosis Lab and quiz – Due ThursdayReview – Due TodayTest/Test Packet – Due TomorrowGQ: How does cell division work?
5.2 Mitosis and Cytokinesis
• Human Cells have 23 pairs of chromosomes (total 46)
• Homologous chromosomes– Two chromosomes that
have copies of the same genes
5.2 Mitosis and Cytokinesis
DO NOW
1. What is the differences between chromatin, chromatids and chromosomes
2. Get out your planner
GQ: How do cells divide?
