Stage and Directions

Labeled Diagram

1) Zygote Stage:
A) Use an orange and a piece of clay the size of a golf ball make a zygote attached to the yolk.
B) Make a label diagram of your model. Label the zygote and the yolk.

2) 2-Cell Stage:
A) Divide the clay of the zygote into 2 equal spheres, cells.
B) Make a labeled diagram. Label cells and yolk.

3) 4-Cell Stage:
A) Divide the clay of each of the 2 cells into two equal spheres, cells.

B) Make a labeled diagram. Label the cells and yolk.

4) 8-Cell Stage
A) Divide the clay of each of the 4 cells into equal spheres, cells.
B) Make a labeled diagram. Label the cells and yolk .

5) 16-Cell Stage
A) Divide the clay of each of the 4 cells into equal spheres, cells.
B) Make a labeled diagram. Label the cells and yolk.

6) 32-Cell Stage
A) Divide the clay of each of the 16 cells not equal spheres, cells.
Note that at this stage there are two layers of cells.

B) Make a labeled diagram. Label the cells and the yolk.

7) Make the Yolk Sac
A) Carefully smash the 32 cells into a cap around the top of the orange to form the yolk sac and then pinch a ridge across the center for the embryo.
B) Label the embryo, the yolk sac and yolk.