Download Asexual Reproduction Slideshow File

Asexual Reproduction
Ms. Faught
Is this Statement true or false?
Two parents are needed
to produced a new
organism
What in the world is this?
This is a starfish
Some
starfish have
the ability to
regenerate if
their limbs
are removed
What is reproduction?
 Reproduction
is the process of producing
offspring
 Offspring- a new organism produced by
one or two parents
There are two types of reproduction
Asexual Reproduction
 Sexual Reproduction

What is asexual reproduction?
the process of producing
offspring with only one
parent.
(often through mitosis cell
division)
How does this happen?
There are several forms of asexual
reproduction, which include:
 Budding
 Binary Fission
 Vegetative Reproduction
 Regeneration through fragmentation
 Grafting and Cloning
 Parthenogenesis
What is Budding?



Budding: an offspring begins as a growth on the
parent
Pinches off to form another organism
Budding is very common in plants and fungi, but
may be found in animal organisms as well, such
as the Hydra.).
Budding in a hydra
Binary Fission

A form of division
where 2 equal
daughter cells are
formed

Examples include
algae & molds
Binary
Fission

Binary fission has four
steps
1. cell growth
2. DNA replication
3. Cell separation
& growth
4. The cell splits in two
Is very similar to mitosis
Vegetative Reproduction

is the reproduction
of a plant not
involving a seed,
including; cuttings,
runners, suckers,
tubers.

Examples: spider
plants,
strawberries,
trembling aspen
The largest organism in the
World???
The aspen tree (Populus
tremuloides) forms large
stands of genetically
identical trees (technically,
stems) connected by a
single underground root
system
The largest known fully
connected aspen is a grove
in Utah nicknamed Pando,
and some experts call it the
largest organism in the world
Grafting
 Type of vegetative reproduction done by
humans
 Inserting a shoot
or bud from one
plant into
another
 (ie. Agricultural
plants)
Regeneration (Fragmentation)



During regeneration, a
piece of an organism
breaks off an can re-grow
Two new organisms are
grown
Starfish and sponges can
do this (they can also
reproduce sexually!)
Cloning
 The
formation of new individual from a
single cell of a parent individual
 Often human created
 (i.e.
agricultural plants)—
 Sometimes clones can have DNA from
other organisms added to genetically
modify them( i.e. round up ready wheat)
Cloning process
Parthenogenesis

Occurs in some species
of social insects, snakes
and some plants

Means “virgin birth”

Unfertilized eggs
become mature
organisms

Eg. Unfertilized ant eggs
become male drones
and fertilized ones
become female workers
and queens
Advantages & Disadvantages of
Asexual Reproduction
 Advantages:
Large number of
offspring
produced (fast)

Only 1 parent
needed

No STDs (sexually
transmitted
diseases)

 Disadvantages


No genetic
diversity (all
clones)
Makes them
susceptible to
disease and
environment
stress (ie drought)
BBC on Asexual Reproduction
http://www.bbc.co.uk/nature/adaptations/As
exual_reproduction#p006v499
Asexual Activity
 Using
the chart on the back, go around
the room to each picture & description.
 For
each one determine what kind of
asexual reproduction is occurring
 Use
the information to give some
advantages & disadvantage to asexual
reproduction