Alleles for a particular phenotype determine what characteristic an organism will express, as with the following example where. 1  Chromosome 1 contains an allele for blonde hair. 2  Chromosome 2 contains an allele for brown hair. 3  Chromosome 3 contains an allele for blue eyes. 4  Chromosome 4 contains an allele for brown eyes.
Because of the patient's smoking history and abnormal chest radiograph, a neoplasm was initially suspected as a cause of SIADH. The head trauma was too remote to be of concern. Although 1 case of risperidone-associated hyponatremia has been reported, the risk seems low with this agent and with olanzapine.
Hyponatremia (Low Sodium) Topic Guide. Hyponatremia (Low Sodium): Low levels of sodium in the blood is referred to as hyponatremia. Causes of hyponatremia include: pneumonia, lung cancer, brain tumors, kidney or heart failure, liver disease, and dehydration. Some of the symptoms of hyponatremia include: headache, nausea and vomiting, confusion, and lethargy. In acute hyponatremia seizures, coma, and even death may occur. Treatment of hyponatremia is generally to balance the electrolytes and raise the sodium levels in the blood.