Cleavage
Cleavage, or initial cell division, of the fish zygote is meroblastic, meaning the early cell divisions are not complete. The yolky end of the egg (the vegetal pole) remains homogenous while the other end (the animal pole) undergoes cell division.
The fate of each of these first cells, called blastomeres, is determined by its location. This contrasts with the situation in some other animals, such as mammals, in which each blastomere can develop into any part of the organism.
Read more about this topic: Fish Development
Famous quotes containing the word cleavage:
“Jesus abolished the very concept of “guilt”Mhe denied any cleavage between God and man. He lived this unity of God and man as his “glad tidings” ... and not as a prerogative!”
—Friedrich Nietzsche (1844–1900)