After fertilization, the zygote immediately undergoes a rapid stage of cleavage and division to form the 32-celled stage known as a blastula.
Fertilization may be defined as the process through which the respective gametes of a male partner (sperm) and female partner (ovum) are successfully fused to form a zygote.
This 32-celled stage comprises of hollow space of cells which is known as blastocysts. These blastocyst cells further undergo a process called gastrulation, in which the speciation of three germ layers forms, i.e. ectoderm, mesoderm, and endoderm.
Therefore, after fertilization, the zygote immediately undergoes a rapid stage of cleavage and division to form the 32-celled stage known as a blastula.
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