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Transcript of A B C D E F G H. yljukBE70.
A B C D E F G H
A B C D E F G H
https://www.youtube.com/watch?v=fKyljukBE70
How a single fertilized egg develops into a new organism
How long does human gestation take? (a baby to develop from fertilized egg to birth)
Which cell process occurs to allow a fertilized egg to grow?
What are the differences between a zygote, an embryo and a fetus?
What is the importance of implantation in a woman’s pregnancy?
Human Gestation requires about 9 months from conception
Or 40 weeks from the first day of the woman’s last menstruation date
Stages of development are divided into three trimestersThe first trimester is often the most
crucial:The fundamental structures are formed
during the first three months
1. Fertilization2. Implantation3. Gastrulation4. Neurulation
The union of a sperm cell and egg cell
Forms a zygote
The zona pellucida is a thick barrier of glycoproteins that surround and protect the egg. Sperm must penetrate this barrier and bind to receptor sites on the egg’s surface before its nucleus can enter the egg.
The acrosome of the sperm cell contains enzymes that will help digest through the protective layers of the egg. The membrane of the sperm will then fuse with the membrane of the egg—if the membrane receptors match up!
The zona reaction prevents multiple sperm from entering the egg. Once a sperm cell binds with the egg, the zona pellucida hardens like concrete freezing loser sperm in their tracks!
Watch it!
A scanning electron micrograph of a human embryo at the eight-
cell stage (day three).
After fert., before implantation . . .a. The zygote begins to divide
-First few mitotic cell divisions are called cleavage
b. Soon a solid ball of cells is formed, called a ....
Image from: http://www.biologyreference.com/Co-Dn/Development.html
2. After fert., before implantation . . .a. The zygote begins to divide
i. First few mitotic cell divisions
are called cleavageb. Soon a solid ball of cells is formed, called a .... morulac. Next, the morula will
change into a fluid filled ball of
cells, called a. . .
Image and video from: http://worms.zoology.wisc.edu/dd2/echino/cleavage/blastula/blastula.html
Implantation
Embryo
When the cells of the blastocyst roll inward to form three layers of cells
Embryo is now a…
http://www.youtube.com/watch?v=blYtsDgVf84&feature=related
EndodermEndoderm: Innermost layer (digestive system)
MesodermMesoderm: Middle layer (internal organs and muscle)
EctodermEctoderm: Outer-most layer (skin and nervous system)
The formation of 3 germ layers
Images from: http://www.childrenscolorado.org/wellness/info/kids/21825.aspx; https://marketplace.secondlife.com/p/Beating-Anatomical-Heart-Animation-Sound/833619?id=833619&slug=Beating-Anatomical-Heart-Animation-Sound; http://www.rocketgirls.org/8-steps-for-beautiful-glowing-skin-cleanse.html; http://biologieprojekt2009.wordpress.com/von-der-zygote-zum-mehrzeller/;
Stem Cells: unspecialized cells that have the potential to differentiate into any tissue.
Cell Differentiation: When stem cells are given specific functions—growth factors and hormones tell them when and how to change.
Once gastrulation is complete, the nervous system begins to develop
Cells of the ectoderm gather and form a tube
http://www.youtube.com/watch?v=qisrNX3QjUg
ZygoteZygote
MorulaMorula
BlastulaBlastula
GastrulaGastrula
Homework:Homework: NONE NONE
DO NOW:DO NOW:
Tissues formed outside the baby to protect and nourish the developing embryo
1. Amnion: forms the amniotic sac—fluid filled to cushion embryo
The “water”
2. Chorion: forms the placenta—combines with the uterus tissues.
A maternal-fetal organ Begins developing at
implantation Exchanges nutrients,
gases, and waste products Drugs and alcohol have been
known to cross the placenta.
http://www.youtube.com/watch?v=O6RLsRlhe0s&feature=related
http://www.medicinenet.com/conception_pictures_slideshow/article.htm
The First 8 Embryonic Weeks…
http://www.medicinenet.com/stages_of_pregnancy_pictures_slideshow/article.htm
Poem, story, or song Track the life of a cell from fertilization to
birth. Be sure to include vocabulary covered in
class!! Must include ONE PICTURE/DIAGRAM
Can be hand-drawn or printed out on assignment
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