Information AboutEmbryo |
| CATEGORIES ABOUT EMBRYO | |
| embryology | |
| developmental biology | |
| greek loanwords | |
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) of the wrinkled frog (''Rana rugosa'').]] An embryo ( Eukaryote in its earliest stage of Development . DESCRIPTION In organisms that reproduce sexually, once a Sperm fertilizes an Egg Cell , the result is a cell called the Zygote that has all the DNA of two parents. In plants, animals, and some Protist s, the zygote will begin to divide by Mitosis to produce a multicellular organism. The term embryo refers to the early stages of this development, after the zygote has divided at least once, but before the process has completed to produce the next stage of development. In animals, the development of the zygote into an embryo proceeds through specific recognizable stages of Morula , Blastula , and Gastrula . This process involves the creating of a hollow sphere of cells in which three tissue layers develop. In plants. the process is not so standard. The stages of embryo development in plants is more dependent upon the kind of plant being produced. INFORMATION
GROWTH OF THE HUMAN EMBRYO Week 1-4 After conception, the embryo will begin to "search" for a place to attach to the woman's uterus. When it finds one and plants itself there, the connections between the mother and the embryo will begin to form, including the umbilical cord. Week 5-8 Chemicals produced by the embryo stop the mother's menstrual cycle. The brain begins to develop, and the heart will begin to beat. Stubs begin to be visible where arms and legs will grow later. All the main organs begin to grow. The embryo's blood type becomes apparent. Embryo is capable of motion, and the eyes begin to form. Most organs have developed or have begun developing. At the end of the 8th week, the embryoic stage is over, and the Fetal stage begins. SEE ALSO EXTERNAL LINKS |
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