Everything about Blastomere totally explained
A
blastomere is a type of
cell produced by division of the
egg after
fertilization.
Human blastomere
In humans,
blastomere formation begins immediately following fertilization and continues through the first week of
embryonic development. About 30 hours after fertilization, the egg divides into two cells. These
mitotic divisions continue and result in a grouping of cells called blastomeres. During this process, the total size of the
embryo (also called a "
zygote") doesn't increase, so each division results in smaller and smaller cells. When the zygote contains 12 to 32 blastomeres it's referred to as a "
morula."
Clinical disorders
It is possible for errors to occur during this process of repetitive cell division. Common among these errors is for the
genetic material to not be divided evenly. Normally, when a cell divides each daughter cell has the same genetic material as the parent cell. If the genetic material doesn't split evenly between the two daughter cells, an event called "
nondisjunction" occurs. Since this event occurs in only one of the several cells that exist at this point, the embryo will continue to develop but will have some normal cells and some abnormal cells. The people are "mosaics" of normal and abnormal cells, so this disorder is called "
numerical mosaicism".
Further Information
Get more info on 'Blastomere'.
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