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The development of multi-cellular organisms begins from a single:::celled zygote, which undergoes rapid cell division to form the blastula. The rapid multiple rounds of cell division are termed cleavage.
The formation of multicellular organisms commences with a single-celled zygote, which divides rapidly to form the blastula. Cleavage refers to the rapid, multiple shots of cell division.
Following conception, the baby enters the embryonic stage, a period of radical shift.
This stage lasts from the fifth to the tenth week of pregnancy. During a certain stage, the baby is referred to as an embryo. Several changes take place even during embryonic stage.
The primary distinction between an egg and an embryo is that an embryo is formed after the gametes are fertilized, whereas an egg is extracted from the ovary and stored in a freezer prior to fertilization.
Thus, multicellular organisms begin with a single-celled zygote that divides speedily to form the blastula. Cleavage is a term that refers to rapid, multiple strikes of cell division.
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