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Blastocoel and blastoderm. The blastula (from Greek Î²Î»Î±ÏÏÏÏ (blastos), meaning sprout) is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoele formed during an early stage of embryonic development in animals. blastula is a sphere of cells surrounding a blastocoele. The blastocoele is a fluid filled cavity which contains amino acids, proteins, growth factors, sugars, ions and other components which are necessary for cellular differentiation. The blastocoele also allows blastomeres to move during the process of gastrulation.
From Zygote to the Adult. The zygote divides to form two, new cells. The nucleus of the zygote undergoes mitosis to distribute equal copies of chromatin to the two new nuclei, of which one each is in one of the two new cells. Each new cell contains a nucleus with the 2n number of chromosomes.Those two cells divide to form four cells, each of the 4 cells contains the 2n number of chromosomes. Cell divisions occur repeatedly, and eventually there are millions of cells in the organism.he zygote of the wild relative of the potato contains the diploid number of 24. Another way of representing this for the corn plant would be, 2n = 20. A corn plant is diploid, with 20 chromosomes (the 2n number of chromosomes for corn) in every cell.