Sickle cell anemia is a genetic disease with severe symptoms, including pain and anemia. The disease is caused by a mutated version of the gene that helps make hemoglobin — a protein that carries oxygen in red blood cells. People with two copies of the sickle cell gene have the disease. People who carry only one copy of the sickle cell gene do not have the disease, but may pass the gene on to their children.<span>
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<span>The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. </span>
My Answer: <span>When only a small amount of DNA is available, such as at a crime scene.
Hope I helped! :D</span>
