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Once you enter into pregnancy week 2, the migrated ball of cells, recognized as a blastocyst, will have arrived, by now, via the fallopian tube and steadfastly attached itself to the lining of your uterus. The blastocyst resembles an egg in that it has 2 layers - an inner and external layer, like that of a shell and a yolk. The internal layer develops into the embryo (known as the embryoblast) and the outer layer develops into the embryo's support system (known as the trophoblast). The baby's first life support consists of: - A water-filled amniotic sac that houses the embryo
- Finger-like tentricles that keep the developing fetus safely attached to the wall of the womb
- A basic placenta, known as a yolk sac, that will provide oxygen and blood supply for the first 12 weeks.
An internal, middle and external layer are formed by the inner part of the blastocyst as it begins to develop into an embryo. Each of these 3 embryonic layers each has a precise programmed function for a particular set of organ developments within the baby. Each single duplicating cell will also be programmed with genetic coding that will hold 23 chromosomes from both the mother and the father, a sum of precisely 46 chromosomes within each and every cell. These chromosomes make up the baby's inherited blueprint and will influence their colorings and bodily features. If there is any distortion in the number of chromosomes the baby has then they will be known to have a genetical flaw which can be determined by a number of exclusive tests that are usually carried out at the end of the developing phase.
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