Within the biological field, blastomeres are embryonic cells that are not yet defined into which cellular tissue they will be distinguished. They are extracted from the embryo when the embryo biopsy is performed, for the execution of the genetic diagnosis on the third day of embryonic development. Its analysis allows us to know how the embryo is chromosomally composed.

Blastomeres are rapidly distributed during the first days of gestation, although the size of the egg remains constant. After three days, the fertilized egg has 16 blastomeres, where from that moment it receives the name of morula. Then blastulation originates, which indicates the beginning of cell differentiation, so that a set of blastomeres are located creating an external envelope called trophoblast, which will later originate the placenta, while the others come together forming the internal cell mass. that will create the embryo.

Therefore, the blastomeres are considered as fetal cells that integrate what is the fertilization process, since once the sperm and the egg are fertilized, they give way to the formation of the zygote. From there, the zygote begins a division process, which generates an increase in the number of cells, these cells are known as blastomeres.

Once the process of cell division begins, the differentiation of these cells begins, which will allow the formation of the different organs and tissues to be determined depending on the pattern established for the creation of the final organism.

The cell differentiation process consists of three phases: blastulation (embryonic stage formed by a sphere of blastomeres), gastrulation (process by which the three germ layers are defined in the embryo), organogenesis (process of formation of the organs of a living being in evolution). Once this entire process is complete, the organism produced is called the fetus, which will continue to evolve until the time of delivery.