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The Ins & Outs of Eggs
Transcript of The Ins & Outs of Eggs
on a diagram
2. Students will examine an egg in order to identify the parts
as a tangible example
3. Students will explain the function of an egg in poultry
4. Students will define the functions of each part of the egg
5. Students will develop cooperative learning skills from
working together in groups
What do you already know about eggs?
Are the eggs you buy from the grocery store fertile? How do you know?
Can you name some parts of an egg?
What are the physical characteristics commonly seen in eggs?
What are eggs used for? In chickens? In humans?
BRAINSTORMING ACTIVITY! **use your KWL organizer I handed out in the beginning of class ;) Chicks hatch from eggs
Eggs contain a yolk and egg white
Eggs have a rigid shell
Can be brown or white
Humans eat eggs
How do chicks hatch from eggs?
What other parts are present in
a chicken egg?
What are the functions of these egg
How do you know the egg is fertile?
What other egg colors exist?
Are the eggs from a grocery store fertile?
Can we see the other parts present in a chicken egg if we crack it open?
Egg is a reproductive cell in
which a new organism develops
Egg will hatch if fertilized by male sperm and incubated at 100.5 F for 21 days
Fertile eggs can be determined by candling; fertilized eggs will appear incandescent and a dark mass
When cracked open fertile eggs contain a blood spot in the germinal disc Blastoderm (germinal disc)-all eggs have this spot; fertilized egg contains a microscopic embryo
Yolk- provides rich source of food
for the developing embryo
Albumen-(egg white) provides water and protein for embryo, has germ killing properties Inner shell membrane- semipermeable membrane that allows air exchange
Outer shell membrane-provides protection from germs and serves as breathing surface for embryo Egg Parts Blastoderm (Germinal Disc) Yolk Albumen (Egg white) Inner shell membrane Outer shell membrane
Air Space Shell Chalazae Blastoderm- (germinal disc) all eggs have this spot;
in a fertilized egg, spot contains microscopic embryo (to the naked eye, sometimes spot is red) Yolk- provides rich source of food for the developing embryo Albumen- (egg white) provides water & protein for embryo. Has germ killing properties Inner shell membrane- semipermeable membrane that allows air exchange Outer shell membrane- provides protection from germs and serves as a breathing surface for embryo Air space-located at large end where there are more pores; allows air exchange; Chick pops cell before hatching to fill lungs with air Shell-provides protection and pores for air exchange Chalazae- supports the yolk in the center of the albuman; acts as a shock absorber to protect the embryo And now for the fun stuff!
Lets get together in groups so we can examine some eggs! I want everyone to examine a hard boiled egg & a fresh egg. Then I want you to find the parts we talked about in the lecture in the eggs. Procedure:
Crack the eggs open and place into saucer
Examine each with a magnifying glass for the parts
Identify the parts in the fresh egg you crack open
Try to find the same parts in the hardboiled egg you peel open Materials:
pencil and paper After Examining...
1. Were you able to find the same parts in the fresh egg in the hardboiled egg? Why or why not?
2. What is the function of the yolk?
3. Predict what will happen if the pores & inner membrane are not present in the egg.
4. What is the purpose of the chalazae?
5. Explain the function of the air space.
6. Was this experiment well designed? Defend your answer.