4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 61 Topic: 5.2 Mitosis and Cytokinesis Essential Question: 1. Explain why the daughter cells.
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4.2 Overview of Photosynthesis•Set up Cornell Notes on pg. 61
•Topic: 5.2 Mitosis and Cytokinesis
•Essential Question:
1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell?
2.1 Atoms, Ions, and Molecules
5.2 Mitosis and Cytokinesis
1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell?
Key concept: Cells divide during mitosis and cytokinesis
5.2 Mitosis and Cytokinesis
• Cells must receive a full set of DNA (no more, no less) to work properly
5.2 Mitosis and Cytokinesis
• DNA- double stranded molecule made of four different subunits of nucleotides (A,T,C,G)
• Chromosome- one long continuous thread of DNA– Each body cell has 46
chromosomes in 23 pairs
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
• 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.
Old DNA New DNAPg. 60
5.2 Mitosis and Cytokinesis
Classwork
• On the provided paper:– Please create a flow map of The Cell Cycle
TITLE of Phase
PICTURE
(with color)
• Description of what is happening (in bullets)
Pg. 140-141 in book
Please include:•Interphase•Prophase•Metaphase•Anaphase•Telophase•Cytokinesis
mitosis
5.2 Mitosis and Cytokinesis
Parent cell
centrioles
spindle fibers
centrosome
nucleus withDNA
• Interphase prepares the cell to divide (G1, S, G2)– During interphase, the DNA is duplicated.
*Not part of mitosis
5.2 Mitosis and Cytokinesis
• Mitosis divides a Somatic (body) cell’s nucleus in four phases.
– Prophase: chromosomes condense and spindle fibers form.
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
Tip to Remember
• Mitosis = Mi “TOE” sis– A toe is part of your body
– MITOSIS only occurs in your Somatic or BODY cells- Every cell EXCEPT sperm and eggs
5.2 Mitosis and Cytokinesis
Cell Cycle Poster Activity
Please draw and explain the part that your group was assigned. Be prepared to share out with the class.
•Cell Cycle (5.1)•Interphase•Prophase•Metaphase•Anaphase•Telophase•Cytokinesis
TOPIC
PICTURE
Explanation
5.3 Regulation of the Cell Cycle
Briefly explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell.
5.3 Regulation of the Cell Cycle
During Interphase the original cell is preparing for cell division by duplicating (copying) its DNA.
During mitosis the chromosomes are split, resulting in 2 nuclei with identical DNA.
During cytokinesis the cell fully separates leaving us with two identical daughter cells.
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