Zigootissa

Zigootissa is a term used in the field of developmental biology to describe the process by which a zygote, the fertilized egg, undergoes a series of divisions to form a blastula, a hollow ball of cells. This process is a critical step in the early development of an organism. The zygote initially undergoes rapid cell divisions, known as cleavage, which can be either holoblastic, where the entire zygote divides, or meroblastic, where only a portion of the zygote divides. The resulting cells are known as blastomeres. As cleavage continues, the blastomeres rearrange themselves to form a blastula, which is characterized by a blastocoel, a fluid-filled cavity. This cavity will eventually give rise to the amniotic sac and the yolk sac in mammals. The transition from zygote to blastula is a fundamental step in the development of all animals, including humans.