Mitotic Stages, whitefish blastula (PM062)

Why are whitefish blastula used to study mitosis? The blastula is an early stage of embryo development and represents a period in the organism&apos s life when most of the cells are constantly dividing. Moreover, the dividing cell have very large and easily seen chromosomes, so its easy to find lots of cells in each stage of mitosis. Human chromosomes on the other hand, are are not clearly visible at higher power magnification. So, for student purposes, whitefish blastula are used.