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 Theprocess by which a cell divides into two
or more cells.

 Cell
division is also the source of tissue
growth and repair in multicellular organisms

S�ǳ��پ�� cell

Sex cell

Replacing dying especially in the
epidermis where the
requirement is continuous.

Repairing the damage, mostly
when the body has faced the
onslaught of trauma and
disease.

 Refers to all body  Contain diploid (2n)
cell except the sex number of
cell. chromosomes .
 Skin cell, muscle  somatic cells contain 46
cell, nerve cell, chromosomes or 23
bone cell, stomach homologous pairs of
cell and liver cell. chromosomes.
 Multicellular
organisms use
mitosis for growth,
cell repair, and cell
replacement.

•P�ܰ��ǲ�� of
mitosis is
replication of
somatic cells and
asexual
reproduction
•Mitosis is the
division of
chromosomes in
a cell
•Usually followed
by cytokinesis or
cell division

•Refers to the  egg cell  Sperm cell
gametes, the
sperm cell of
male and egg cell
of the female

 Sex cells only contain 23 chromosomes and
are called haploid.
 These cells have half the amount that a
normal non-sex cell would have.
 So when they divide only 23 chromosomes
are given to the new cell.

After these sex cells
combine and
fertilization occurs
the resulting cell
that is formed is
called a zygote
As soon as the
zygote is formed, it
then begins to go
through cell
division.

During Meiosis gamete (sex) cells undergo a “double
division”, maintaining the DNA, but reducing the
chromosomal count to 23

Sperm (23) + Egg (23) = Fertilized Cell(46)

 Autosomes
Contain genetic information for most human
characteristics, such as eye color, hair color,
height, and skin pigmentation
Sex Chromosomes
Primarily determines whether an individual is
female (2 X chromosomes) or a male (1 X and
1 Y chromosomes)

 Somatic cell  Sex cell
Is any cell that is  Refers to gametes
non reproductive the egg cell and
cell. sperm cell
 Contain 46  Contain 23 (n) of
chromosomes or chromosomes
23 homologues  Undergo mitosis
pair of and meiosis
chromosomes
 Undergo mitosis

1. Mitosis produces 2 daughter cells that are
genetically identical to the parent cell.
Meiosis produces 4 daughter cells that are
genetically different from the parent cell.
2. Mitosis produces diploid (2n) daughter
cells. Meiosis produces haploid (n) daughter
cells.
3. In meiosis, a process called crossing over
occurs, whereby genetic material is
exchanged b/w homologous chromosomes.

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Cell division

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