01:34
Mental Retardation and Genetics
Dean Hamer, Director of the Gene Structure and Regulation Unit at the National Cancer Institute, talks about the role genetics plays in many forms of mental retardation. In the case of PKU, a type of retardation that's caused by an enzyme deficiency...
01:34
Causes of Mental Retardation
Dr. Ed McCabe, Chief of the Mattel Children's Hospital at UCLA, talks about prenatal tests that can be done to test for signs of mental retardation in the fetus. "Down's Syndrome is certainly one that we're very aware of and that we know how to test...
06:22
Family's Struggle, A
Dr. Ed McCabe, Chief of the Mattel Children's Hospital at UCLA, talks about the challenges faced by a Colorado family in which two children were afflicted by a serious genetic disorder.