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    Could someone help me withe the key ideas and explain stem cells
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    The nucleus contains the genetic information for a cell (genes/chromosomes) Genes code for certain functions. A cell is unspecialised if it does not code for anything (a stem cell) The nucleus can then be removed and altered to serve a paticular function then put into a cell and divide normally to do this. Embryonic stem cells are taken from early embryos and can code for anything. Adult stem cells are taken from adults and can code for lots of things but not all. Key ideas are to make sure you understand genetics, how dominant/recessive genes work (know the tables), microorganisms and disease, the circulatory system and heart disease, how evolution works, sustainability and the carbon and nitrogen cycle. Just look through your revision guide to recap stuff, the key ideas are simple really, it's memorizing the keywords and details that's difficult.
 
 
 

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