BIOL140 Lecture Notes - Lecture 5: Metaphase, Nuclear Membrane, Dna Replication

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21 Jun 2016
Department
Course
Professor
Copy
Identical to each other
Identical to the parent cell
Daughter cells
Duplication Division
Cell Components and Chromosomes (DNA) are copied
To replace injured cells
Growth and repair
Purpose of Mitosis
Cell caries on normal functions
A signal has been received to divide
G1 Phase
Each chromosome is copied
Two strands separate
Form unbounded, unstable nucleotides
Week bonds between bases are broken
1)
Weak bonds are formed
Free DNA nucleotides pair up with exposed nucleotides
2)
Phosphate-Sugar backbone forms
3)
Process
S Phase
Original strand is found in new chromosome
New Chromosome is made of original strand + Complementary
DNA Replication is a semiconservative process
DNA Replication
a)
Mitosis
BIO LECTURE #5
September 24th, 2015
Environment- everything immediately
outside of the cell
NOTHING happens in a cell without
instructions from the environment
Original Strand
Centromere
Replication
Chromosome
Two Chromatids
Cells structures move around to allow division
Nuclear Membrane breaks down
Cell gets ready for division
Organized and ready for cell division
Visible under light microscope
Chromosomes are compacted
Prophase
1.
Chromosomes are organized so the sister chromatids can be separated
Line up along metaplate
Metaphase
2.
Separation of sister Chromatids
Move to opposite ends of cell
Spindle Fibres pull chromatids apart
Anaphase
3.
Nuclear membrane forms around chromosomes
Cell rebuilds and reorganizes
Telophase
4.
4 Phases of Mitosis
b)
Chromatids
Metaphase Plate
Centrosome
Anaphase
Chromosomes
Metaphase Plate
Metaphase
Division of parent cell into two daughter cells
Cytokinesis
C)
Original Strand Complementary Strand ComplementaryStrand
Spindle Fibres
Spindle Fibres
Lecture Five
October 4, 2015
2:19 AM
BIO 140 Page 1
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