A genetic disorder is caused when an abnormality in the genetic framework of an individual is present. Genes are passed from parents to child. When a mutation of a gene occurs, it prevents it from developing normally. Some genetic disorders are inherited and others are a result of malformation of cells during development. There are four types of genetic diseases---single-gene diseases, multi-factorial diseases, chromosomal diseases and mitochondrial diseases. Cystic Fibrosis
Cystic fibrosis, the most common fatal genetic disease in America, is a single-gene genetic disease. It requires the passing on by both parents of the defective gene responsible for the disease. This defect causes the development of mucous that clogs the lungs and negatively affects the pancreas. The symptom of salty-tasting skin is caused by the inability of the body to move sodium chloride in and out of cells. Children may inherit only one faulty gene and be a carrier, passing along the defective gene to their children.
Huntington's disease, a single-gene genetic disease, affects the ability to talk, move and think. This inherited disorder is a result of a disease process that destroys cells in the brain. Huntington's disease is a certainty for everyone who inherits the mutated gene. Genetic testing for this incurable disease can determine if the mutated gene is present in the fetus or at any age. Alzheimer's Disease
Alzheimer's disease (AD) is a multi-factorial genetic disease caused by mutations in multiple genes and environmental factors. Alzheimer's may be early onset, affecting people between the ages of 30 and 60, or it may be late onset, affecting individuals 60 years and older. Early-onset AD is rare, but only requires one of the mutated genes from a parent. Late-onset AD does not have the same genetic mutations as early-onset. Alzheimer's affects a person's thought processes, memory and language. Down Syndrome
Down syndrome is a chromosomal abnormality...
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