Well, it seems like after the 8th week it's called a fetus, but before it's just an embryo.
A developing baby in the early stages is called an embryo. This stage begins at fertilization and lasts for about 8 weeks. After that, the term fetus is used to describe the developing baby.
The term for the joining of an egg and a sperm is fertilization.
A zygote is formed when a sperm cell fertilizes an egg cell. It is a single cell that later divides and develops into an embryo. An embryo is the early stage of a developing organism, typically from around 2 weeks to 8 weeks after fertilization. A fetus is the later stage of prenatal development, usually starting around 8 weeks after fertilization until birth.
An embryo is the term used to describe a developing organism in its early stages of growth and development.
Plants are referred to as embryophytes because they develop from an embryo that forms after fertilization. This term highlights a key characteristic of land plants: their reproductive cycle includes a multicellular diploid phase (the sporophyte) that arises from the fertilization of gametes, leading to the formation of an embryo. Additionally, the term emphasizes their evolutionary adaptation to terrestrial environments, where the protection and nourishment of the embryo is crucial for survival.
A zygote is called a fetus at the end of the eighth week after fertilization, when all major organ systems are in place. At this stage, the developing organism is less than 1 inch long and is starting to resemble a human being in shape.
like
Foetus. You call it as an embryo in first 8 weeks.
'Gestation' is the term used to describe the growth of an embryo, or foetus, inside the womb of an animal that gives live birth. 'Incubation' is the term used when the embryo develops inside an egg, outside the parent's body.
embryo
In short, an embryo undergoes both cellular division and cellular differentiation to become a fetus. This is achieved by the genetic program present in the cell(s) which controls both mentioned processes. It is the stage of developing mammal.After 9th week of fertilisation,the embryo can be called foetus.
The fertilized egg is known as the zygote. Over time, it develops into the embryo, then the fetus.