Genetics And Evolution: Cystic Fibrosis And Down Syndrome

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gene responsible for cystic fibrosis was identified on chromosome 7 (out of 23 chromosomes). Since that time more than 200 different mutations in the cystic fibrosis gene have been described, and tests have been developed to detect the most common alterations. These tests can identify unaffected carriers of the disorder. Sickle-Cell Anemia Sickle-Cell Anemia, also called sickle-cell disease, is a hereditary condition where hemoglobin, an oxygen-carrying protein in the blood, is altered, leading to periodic interruptions in blood circulation. All over the world. the disease is found predominantly in blacks, of whom approximately 1 in 400 are affected; it mainly occurs in the US, in the Middle East and the Mediterranean area.
Symptoms of the condition appear at about six months of age and may include enlargement of the abdomen and heart and painful swelling of the hands and feet. In adolescence, sexual maturation may be delayed. The disturbances in blood flow associated with the ...

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