shell outer shell membrane inner shell membrane air cell albumen chalazae yolk blastodisc = infertile white germinal spot blastoderm = fertile tan, 4 x’s larger + f+ f = food source

Germinal Spot Blastodisc: Infertile Color: white Size: tiny, circular Blastoderm: Fertile Color: tan, clear ring Size: 4 x’s larger

First food source for the growing embryo: 1 : The first food source is the _________. The embryo absorbs ______________ from the shell to help build strong __________. shell calciumbones Three Sources of Nutrients

2: The _____________is a food source for the embryo. There are two layers of albumen; _____________ and ______. The albumen provides __________and ___________. albumen thick thin protein water Second food source for the growing embryo: Three Sources of Nutrients

Third food source for the growing embryo: 3: The main source of food is the ________. The yolk provides the embryo with __________,_________, and _________. vitaminsminerals fats Three Sources of Nutrients Yolk

By day 21, the egg shell _______________ in strength. The embryo is absorbing the _____________ from the shell for food. This process will help the embryo to get out of the shell once it has developed into a chick. The shell is weak or fragile. During the 21 days, the egg ______________________ grow in size. does or does not decreases calcium does not

4 The embryo resembles a spider in size and shape. shell embryo yolk albumen air cell 4

White embryology notebook: Page 3: Read Page 4: Complete –use word bank only Page 5: Read and complete all activities Page 13: Draw, label, and color your observation of the embryo on Day 4. Homework