We must know that fertilization in vertebrate is as important as organogenesis because if anything went wrong it will surely affect the end of organogenesis. As we know that fertilization is the fusion of the mature sex cells, the sperm and the egg. It is very crucial that the male mature sex cell able to travel through the female reproductive path in order to penetrate the egg after been released and after the have sperm penetrated the egg then the next step is very important as well. After fertlization, is the cleavage where rapid mitotic divisions occur and they divided into smaller blastomeres, which the blastomeres fomred a sphere, known as a blastula. The blastocoel cavity in the beginning of gastrulation is important for allowing cell movement to occur during gastrulation period.
"It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life." Lewis Wolpert (1986).
After the rapid mitotic division in cleavage, thne gastrulation is the next where the blastomeres undergo dramatic movement and change their position relatives to one another. The series of cells rearragements is known as gastrulation and the embryo is said to be at the gastrula stage. At the end of the gastrulation results in three germ layers called Ectoderm, mesoderm and endoderm. And these three germ layers will interact to form organs needed for the development of the embryo and the is called organogenesis. Organogenesis is when three germ layers interact with one another and rearrange themselves to produce tissues and organs.
Fnally, the quality of organs and tissues developed depends on the crucial stages that the fertilized egg path through from fertilization to organogenesis and there are essential stages that the embryo need to take and the rapid mitotic division, and their changing of cells positioning to formed tissues and organs.
References:
www.wikipedia.com
Developmental Biology. Ninth Edition by Scott Gilbert
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