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Lesson 12
What are binary fission
and budding?
You have a mother and a
father. Two parents, one
male and one female.
Your dog or cat also has two
parents.
So does a fly, a snake, or
a fish.
In fact, most of the living
things you can think of
have come from two
parents.
Reproduction that requires
two parents is called sexual
reproduction.
Another kind of
reproduction requires only
one parent. This kind of
reproduction is known as
asexual reproduction.
Binary fission is one kind
of asexual reproduction. It
is the simplest form of
asexual reproduction.
It is simple cell division.
Bacteria and many other one
celled organisms reproduce
this way.
This is how it happens:
An organism grows to full
size.
The hereditary material
(chromosomes) duplicate.
The organism then splits in
half.
You now have two
daughter cells. Each is
exactly alike.
They are also exactly like
the parents cell, just half the
size.
Each new daughter cell
carries on its own life
functions. When each
reaches full size, they
divide in half again.
This process goes on
and on.
Another form of asexual
reproduction is budding.
In budding, a new cell is
formed from a small bud
which grows out from the
parent cell.
You now have two cells of
very different sizes.
When the daughter cell is
large enough, it
reproduces.
Even though the sizes of
the cells are different, the
hereditary material is the
same.
The daughter cell is
exactly like the parent
cell, only much smaller.
Yeast is the most common
organism that reproduces
by budding.