Embryogenesis is the process by which the embryo is formed and develops, until it develops into a fetus.

Embryogenesis always starts with the fertilization of the ovum (or egg) by sperm. The fertilized ovum is referred to as a zygote. The zygote undergoes rapid mitotic divisions with no significant growth (a process known as cleavage) and cellular differentiation, leading to development of an embryo.

Although embryogenesis occurs in both animal and plant development, this article addresses the common features among different animals, with some emphasis on the embryonic development of vertebrates and mammals.

Read more about EmbryogenesisFertilization and The Zygote, Cleavage and Morula, Formation of The Blastula, Formation of The Gastrula, Somitogenesis, Organogenesis

Other articles related to "embryogenesis":

Embryogenesis - Organogenesis
... include the heart and somites (also above), but from now on embryogenesis follows no common pattern among the different taxa of the animal kingdom ...
Cell Fate Determination
... Almost all animals undergo a similar sequence of events during embryogenesis and have, at least at this developmental stage, the three germ layers and undergo gastrulation ... While embryogenesis has been studied for more than a century, it was only recently (the past 15 years or so) that scientists discovered that a basic set of the ... and the leech (Helobdella), can all be used to study embryogenesis and developmental biology relevant other animals, including humans ...
Prenatal Development (biology) - Embryogenesis
... Embryogenesis is the process by which the embryo is formed and develops ... It starts with the fertilization of the ovum or oocyte (also known as the egg), which, after fertilization, is then called a zygote ...
Developmental Biology - Developmental Model Organisms
... and Xenopus tropicalis) Chicken Gallus gallus Mouse Mus musculus (Mammalian embryogenesis) Invertebrates Lancelet Branchiostoma lanceolatum Ascidian Ciona ...