![]() ![]() Thus, it can be assumed that since one of the twin cells was totipotent, the destroyed one originally was as well. Studies have analyzed monozygotic twin mouse blastomeres in their two-cell state, and have found that when one of the twin blastomeres is destroyed, a fully fertile adult mouse can still develop. This has been demonstrated through studies and conjectures made with mouse blastomeres, which have been accepted as true for most mammalian blastomeres as well. The blastomere is considered totipotent that is, blastomeres are capable of developing from a single cell into a fully fertile adult organism. These pumps allow the inside of the embryo to fill with blastocoelic fluid, which supports the further growth of life. Once this begins, microtubules within the morula's cytosolic material in the blastomere cells can develop into important membrane functions, such as sodium pumps. These are the preliminary stages in the embryo beginning to form. When the zygote contains 16 to 32 blastomeres it is referred to as a morula. During this process, the total size of the embryo does not increase, so each division results in smaller and smaller cells. These mitotic divisions continue and result in a grouping of cells called blastomeres. The two-cell blastomere state, present after the zygote first divides, is considered the earliest mitotic product of the fertilized oocyte. About 90 minutes after fertilization, the zygote divides into two cells. ![]() In humans, blastomere formation begins immediately following fertilization and continues through the first week of embryonic development. ![]()
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