Transcript Investigation 2 power point

The Stages of Life Form
Development
D
By: Ariel White
Animal Development
• Animals go through a long complicated
process while they are developing.
They are probably the most
complicated kingdom when it comes to
growth
Steps of Animal Development
• First, the sperms cell membrane fuses
with the egg’s cell membrane. This
forms a zygote.
• The DNA replication begins and cell
division follows. The divisions of zygote
is called cleavage.
• After time, a ball of cells called the
blastula is formed, the center is called
blastocoel.
Steps of Animal Development, cont.
• The next step is the blastula collapses
inward. This reorganizes the cells.
This process is called gastrulation.
• The previous step then turns the
blastula into an embryo called the
gastrula.
• The blastula then continues to fold
inward until it is cup shaped.
•
Animal Development Stages Cont.
• The blastula then inlayers a deep cavity
called the archenteron. This layer will
later function as the gut.
• From here, different layers of cells from.
• The fist of these layers is the ectoderm.
This layer will later function as the outer
layer of skin, hair, nails, and nervous
system.
Animal Development Stages cont.
• The next layer to be formed is the
endoderm. This layer will later serve as
the throat passage & other organs
associated with that.
• The final layer is the mesoderm, which
will develop into the skeleton, muscles,
and inner layer of skin.
Bacteria Development
• Bacteria really don’t have a complicated
cell division and growth process like
animals do. The reason for this is they
go through asexual reproduction.
• What this means is a adult bacteria
splits and two and will form an entire
new bacteria.
Plant Development
• The next kingdom that we are going to
look at is the plant kingdom. And like
animals, they also go through a long
process of development.
Stages of Plant Development
• Here is a diagram of plant development:
More on Plant Development
• Like in animals, plant cells divide and
form different parts.
• Unlike animals cell division for plants is
continuous.
Stages of Plant Development
• First, the egg cell is contained in the
embryo sac. The sperm nuclei leave
the pollen grain. This generates a
zygote.
• Cell division begins leaving a larger and
smaller cell. The nutrient supply forms
for the larger cell.
• More cell division leads to the globular
stage. Tissue systems are formed at
this point
Stages of Plant Development
cont.
• Then, the globe shape is lost and the
beginnings of leaves are formed. Also
called cotyledons.
• The cotyledons then make a torpedo
shape and the meristems are
developed. These become the adult
structures when germination starts.
Stages of Plant Development cont.
• From here everything is dormant until
the plant starts to germinate.
• Cell division, as I said earlier, in plants
never ends so unless you want a never
ending power point, here is a good
place to stop on plant development.
Thank You
• Thats the end of this power point and
the cell division steps in the three major
kingdoms!
Bibliography
• http://biology.kenyon.edu/courses/biol114/Ch
ap12/Chapter_12A.html
• http://www.emc.maricopa.edu/faculty/far
abee/biobk/biobookmeiosis.html
• Modern Biology chapter 24 section 2,
chapter 34 section 4