Goldman L, Schafer AI, eds. The family's medical history can be traced by pedigree analysis. A health care professional with special training in genetics and counseling who can provide expert advice about genetic disorders and prenatal testing.
Spontaneous mutation of one gene creates a dominant mutation that rapidly accelerates aging. Chromosomes also come in pairs. In persons with PKU, dietary phenylalanine either accumulates in the body or some of it is converted to phenylpyruvic acid , a substance that normally is produced only in small quantities.