Between the fertilized egg and the 32-cell stage of development, the embryo, and fetus will eventually develop from the inner cell mass, whereas the placenta will eventually develop from the outer cell mass.
What is fertilization?
Fertilization is the process of fusion of male and female gametes. Through the fusion of gametes, new offspring are produced. Fertilization occurs in the female body. Fusion may be artificial, by the process of IVF.
Fusion of the egg by the sperm of the male produces four cells, of which one is the fertilized egg that formed the fetus. There are different stages of fertilization. These stages are when the penetration occurs, there are changes in the cell membrane of the egg.
Thus, the size of the blastomeres increased, and the development of the outer mass happened.
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