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| علوم و طبيعة علوم الأرض و البحار, علوم النباتات, علوم الحيوانات, الفلك وعلوم الفضاء , و البيئة |
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#1
11-11-2009, 04:52 PM
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| الكروسومات الكروسومات الدكتورة رنا الشامي  Chromosomes : The blocks of genetic material in the nuclei of all cells in the body. They carry the genes – the unit responsible for the transmission of the parental characteristics to the offspring and also for passing on essential information with each cell division during the development of the embryo , during the growth of a baby to an adult , and throughout life . The material that makes up the chromosomes is deoxyribonucleic acid (DNA) . Human cell contain 23 pairs of chromosomes , 22 are identical pairs , but the 23rd pairs , the sex chromosomes , are identical only in the females , who have two-xx chromosomes . In males the 23rd pairs contains only one x chromosome and a smaller y chromosome . The sex cells themselves ( the spermatozoa and ova ) contain only half the normal number of chromosome – one of each of the 23 pairs – so that when fertilization take place the full complement of 46 is restored . If this balance disturbed , many congenital defects such as Down s syndrome (mongolism) will be the result , less obvious mutations are also responsible for disorders such as hemophilia and muscular dystrophy. Other examples : Calcium : 8.4-10.2mg/dl Catecholamines Cerebrospinal fluid pressure 70-180mm water volume 100-160ml Ceruloplasmin : 20-46mg/dl Chloride : 98-106mmol/L As well as in : Cholesterol ….. Complement components …. Copper … Cortisol … Creatinine  |
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#4
11-12-2009, 03:53 PM
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| Iam biology teacher but thank u sooooooooo much for the information
__________________ إلهي لاتعذبني فإني مقر بالذي كان مني ومالي حيلة إلا رجائي لعفوك إن عفوت وحسن ظني وكم من ذلة لي في الخطايا وانت علي ذو فضل ومن أجن بزهرة الدنيا جنونا وأقطع طول عمري بالتمني يظن الناس بي خيرا وإني لشر الخلق إن لم تعف عني |
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