Review Questions
Which of the following is false?
- The endoderm, mesoderm, ectoderm are germ layers.
- The trophoblast is a germ layer.
- The inner cell mass is a source of embryonic stem cells.
- The blastula is often a hollow ball of cells.
Hint:
B
During cleavage, the mass of cells:
- increases
- decreases
- doubles with every cell division
- does not change significantly
Hint:
D