what is blastocyst and blastomere? diff bw cleavage and division in human reproductive cells?
Dear student,
Blastocyst- As the zygote moves from the fallopian tube down towards the uterus, it starts dividing by successive nuclear and cell division resulting in the formation of 8-16 celled embryo called morula which continues to divide to form blastocyst. The blastocyst gets embedded into the thickened inner wall of the uterus through the process of implantation. The structure consists of a hollow sphere of cells called trophoblast cells.The inside of this comprises small cluster of cells called inner cell mass(ICM). The inner cavity is known as blastocoele.
Blastomere- The one-cell embryo after the fertilization undergoes several cleavages (cell divisions) progressing through 2-cell, 4-cell, 8-cell and 16 cell stages. These cells are known as blastomeres. Thus, it is an essential part of blastula formation.
The process of cleavage could be defined as the division of cells in the early embryo. It is a series of mitotic division.The cells called blastomeres are formed from this process. This is followed by formation of a compact mass of cell called morula. The clevage process comes to an end with the formation of blastula.
Cleavage is different from other forms of cell division where the number of cells increases without increasing the mass. Also,in cleavage the ratio of cytoplasmic to nuclear volume gets increasingly smaller as cleavage progresses or it could be said that cytoplasmic volume does not increase.
On the other hand, division in reproductive cells is meiotic division which leads to formation of haploid gametes.
Regards.
Blastocyst- As the zygote moves from the fallopian tube down towards the uterus, it starts dividing by successive nuclear and cell division resulting in the formation of 8-16 celled embryo called morula which continues to divide to form blastocyst. The blastocyst gets embedded into the thickened inner wall of the uterus through the process of implantation. The structure consists of a hollow sphere of cells called trophoblast cells.The inside of this comprises small cluster of cells called inner cell mass(ICM). The inner cavity is known as blastocoele.
Blastomere- The one-cell embryo after the fertilization undergoes several cleavages (cell divisions) progressing through 2-cell, 4-cell, 8-cell and 16 cell stages. These cells are known as blastomeres. Thus, it is an essential part of blastula formation.
The process of cleavage could be defined as the division of cells in the early embryo. It is a series of mitotic division.The cells called blastomeres are formed from this process. This is followed by formation of a compact mass of cell called morula. The clevage process comes to an end with the formation of blastula.
Cleavage is different from other forms of cell division where the number of cells increases without increasing the mass. Also,in cleavage the ratio of cytoplasmic to nuclear volume gets increasingly smaller as cleavage progresses or it could be said that cytoplasmic volume does not increase.
On the other hand, division in reproductive cells is meiotic division which leads to formation of haploid gametes.
Regards.