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The Importance of Mitosis
The need to heal!
The need to grow!
DNA

Made of
nucleotides
Phosphate
 sugar
 Nitrogen base





Adenine
Guanine
Cytosine
thymine
Coiling



Uncoiled DNA called chromatin- between cell divisions
Happens during cell division
DNA wraps tightly around proteins called histones
Chromosomes


Chromosome- consists
of two identical halves
connected together by a
cnetromere
Chromatid- a half of one
chromosome.


Contains one
complete set of
information
Copies itself to make
the other chromatid
How many chromosomes??
Each human diploid
cell is 2N and
contains 46 total
 23 identical pairs
( 23 x 2 = 46 )
“homologous
chromosomes”

carry the same traits
How many chromosomes??
Egg and sperm cells only carry one set of 23
 Each human haploid cell is “N”
 Egg and sperm combine to form 2N or 46
 All other chromosomes are called autosomes
 Each human or animal cell has sex
chromosomes XX or XY


Define the sex of the organism
Cell Cycle
G1 = cell grows
 S = DNA replication
 G2= Prepare to divide


M= Mitosis
INTERPHASE
Stages of Mitosis





Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Interphase
What Stage?
What Stage?
What Stage?