Chromosomes 2 and 12 are normal components of everyone's genetic makeup. Every cell in the human body has a chromosome 2 and 12 (all cells have 23 numbered chromosomes, and then a combination of x or y chromosomes which determines sex). Every normal chromosome contains a wealth of information, that determines how our bodies are formed and how they function. What you may be asking is what could they be looking for on chromosome 2 and 12, that might be related to your grandson's symptoms?
This is something that I am not familiar with directly, but on a little research I found the following. Below are the links to two web pages that describe these two chromosomes, with some general information:
http://ghr.nlm.nih.gov/chromosome=2
http://ghr.nlm.nih.gov/chromosome=12
this is provided by the national institute of health, so it is a reliable source. Within those pages I found links to "conditions" commonly linked to these chromosomes. I have copied these links below (cut and paste these links into your browser to view them if you can't just click on them):
http://ghr.nlm.nih.gov/chromosome=2/show/Conditions;jsessionid=09A04468753B2671AA1748E708D67E3E
http://ghr.nlm.nih.gov/chromosome=12/show/Conditions
What this means, in essence, is that genetic researchers have discovered errors in the chromosomes of certain individuals that then lead to (or contribute to) these diseases. I see nothing in common between the two lists (sometimes a single condition can be related to two chromosomes) so you might want to look through the lists and see if any of them sound familiar. Better yet, ask your pediatrician or the physicians who are caring for your son, "what are you worried about and what are you testing for exactly". If you wish, you can also click on any of the listed disorders, and a great explanation of what that disorder is provided. There is a lot of very good information here, and it is reliable.
Unfortunately, from your description, it really isn't possible to say what exactly they are looking for. But it is possible to say that they are performing genetic testing because your grandon's condition has them concerned that he might have a genetic disease. One note here: a family or parents or grandparents are never to blame in this sort of situation. Our chromosomes and our genes are complicated, and genetic disease have persisted throughout the ages for a reason (some genetic abnormalities lead to beneficial changes in individuals). Like any disease or disorder, this is no one's fault.
Take a look, and I hope that I was some help to you. You have my deepest sympathies, and my heart goes out to you and your family. I hope that the testing proves fruitful, and a diagnosis and perhaps treatment are in the near future.
Take care, and my best to your family.
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