MICROANATOMY

Detailed explanation-1: -zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.

Detailed explanation-2: -Once fertilized, the egg is called a zygote. Fertilization is not complete, however, until the two haploid nuclei (called pronuclei) have come together and combined their chromosomes into a single diploid nucleus. In fertilized mammalian eggs, the two pronuclei do not fuse directly as they do in many other species.

Detailed explanation-3: -A zygote is an egg that has been fertilized by sperm, and which could develop into an embryo.

Detailed explanation-4: -An embryo is a stage following the zygote stage. The process of formation of the zygote is known as fertilization. The process of formation of the embryo is known as embryogenesis.