|MadSci Network: Genetics|
Genetic screening can be used before couples marry to determine if they have similar recessive gene disorders that can pass on to their offspring. Their genes are searched for specific sequences that can lead to genetic problems in their children. If they are found then the couple is informed of possible complications that can happen during child development. Sorry for the delay in this answer. Mike For more information, refer to a basic textbook on Medical Genetics, such as Gelherter's Fundamentals of Medical Genetics.
Try the links in the MadSci Library for more information on Genetics.