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| Prevents these Rhesus problems if it is given during pregnancy |
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| family trees that are used to show how traits are inherited |
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| The gene for sickle cell anemia is on chromosome |
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| affects the lungs. Roughly 4 % Caucasians are carriers. The gene is on chromosome 7 |
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| affects the nerves. Symptoms appear usually around age 40. The gene is on chromosome 4. New research. Huntingtons is a disease caused by a "triplet repeat" : the DNA code CAG is repeated 36 to 100 times in people with Huntingtons disease, but only 10 to 30 times in normal people. |
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| a cell inherits the wrong number of chromosomes |
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| a photo of the chromosomes in a person. |
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