Concept
Version 8
Created by Boundless
Animal Reproduction and Development
Embryonic development
During embryonic development, the zygote undergoes a series of mitotic cell divisions, or cleavages, to form an eight-cell stage, then a hollow blastula. During a process called gastrulation, the blastula folds inward to form a cavity in the gastrula.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Features of the Animal Kingdom. October 17, 2013."
http://cnx.org/content/m44655/latest/Figure_27_01_03.jpg
OpenStax CNX
CC BY 3.0.