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Embryonic Stem Cell Research
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[quote]Before discussing the subject we have to know: “What is the embryo and it’s what stage is intervened for the purpose?” The sperm fertilises the egg, in the female genital tract, to form a zygote, which is unicellular (consisting of one cell). This unicellular zygote divides into two, two into four, four into eight and so on so forth. The stage before 150 cells (as in the article- the link) is intervened for the purpose and this stage is reached within FIRST WEEK OF PREGNANCY when the mass of the cells (blastocyst) is floating free in the female genital tract and STILL NOT IMPLANTED into the wall of the uterus (womb). According to the human Embryology, the EMBRYO is the stage between fourth and eight weeks of pregnancy. This is the time when heart is developed and starts beating to show the signs of life. After eights weeks till delivery it is called the FOETUS. In THE EMBRYONIC PERIOD the different organs are developed while in THE FOETAL PERIOD the organs grow in size till delivery. By the way few words about the TWINS (For general knowledge) 1) When the zygote divides into two cells and due to some reasons each cell acts as one zygote leading to the development of two separate babies called IDENTICAL TWINS. These twins are of same sex and other similarities even their fingerprints. 2) On the other hand if two separate eggs are fertilised by two separate sperms then the twins developed are called UN-IDENTICAL TWINS. These twins may be of different sexes and other dissimilarities but similar to their other brothers and sisters. The home deliveries must be avoided.[/quote]
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