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Embryos (and one tadpole) of the wrinkled frog (Rana rugosa).An embryo is an animal or a plant in its earliest stage of development.
1 Plants
In botany, a plant embryo is part of a seed, consisting of precursor tissues for the leaves, stem (see hypocotyl), and root (see radicle), as well as one or more cotyledons. Once the embryo begins to germinate — grow out from the seed — it is called a seedling.
2 Animals
The embryo of vertebrates is defined as the stages between the first division of the zygote (a fertilized ovum) until it becomes a fetus. An embryo is called a fetus at a more advanced stage of development and up until birthChildbirth (also called labour birth or parturition is the culmination of pregnancy, the emergence of a child from its mother's uterus. It can be considered the opposite of death, as it is the beginning of a person's life. Age is defined relative to this or hatching. In humans, this is from the eighth week after outward
2.1 Stages
MorulaMorula is a stage of embryonic development in animals, including the 16-cell phase, the 32-cell phase, and the 64-cell phase. The morula is produced by embryonic cleavage, the rapid cell division of the zygote with virtually no growth. The morula is a sol-> blastulaThe blastula is an early stage of embryonic development in animals. The blastula follows the morula and precedes the gastrula in the development sequence. A blastula has more than 64 cells, with a large central cavity called the blastocoel. Developmental-> gastrulaThe gastrula phase of embryonic development is seen in all animals except the sponges. It follows the blastula phase. The gastrula phase is marked by a dramatic restructuring called gastrulation. After gastrulation is complete, the embryo develops into a.
See also : in vitro fertilization -- embryologyEmbryology is the science of the early development of organisms, between the one-cell stage (generally, the zygote) and the beginning of free living. Embryology therefore deals with the various steps necessary for the correct and complete formation of the
3 External links
EmbryologyEmbryology is the science of the early development of organisms, between the one-cell stage (generally, the zygote) and the beginning of free living. Embryology therefore deals with the various steps necessary for the correct and complete formation of the
Developmental biology
