This should alleviate the defect caused by a faulty gene or slow the progression of the disease. A major obstacle has been the delivery of genes to the appropriate cell, tissue, and organ affected by the disorder. Researchers have investigated how they can introduce a gene into the potentially trillions of cells that carry the defective copy. Finding an answer to this has been a roadblock between understanding the genetic disorder and correcting the genetic disorder. Epidemiology
Around 1 in 50 people are affected by a known single-gene disorder, while around 1 in 263 are affected by a chromosomal disorder. Around 65% of people have some kind of health problem as a result of congenital genetic mutations. Due to the significantly large number of genetic disorders, approximately 1 in 21 people are affected by a genetic disorder classified as "rare" (usually defined as affecting less than 1 in 2,000 people). Most genetic disorders are rare in themselves. There are well over 6,000 known genetic disorders, and new genetic disorders are constantly being described in medical literature. History
The earliest known genetic condition in a hominid was in the fossil species Paranthropus robustus, with over a third of individuals displaying amelogenesis imperfecta.
See also
FINDbase (the Frequency of Inherited Disorders database)
Genetic epidemiology
List of genetic disorders
Population groups in biomedicine
Mendelian error

References
External links

Public Health Genomics at CDC
OMIM — Online Mendelian Inheritance in Man, a catalog of human genes and genetic disorders
Genetic and Rare Diseases Information Center (GARD) Office of Rare Diseases (ORD), National Institutes of Health (NIH)
CDC’s National Center on Birth Defects and Developmental Disabilities
Genetic Disease Information from the Human Genome Project
Global Genes Project, Genetic and Rare Diseases Organization
List of Genetic Disorders - Genome.gov