In an autosomal recessive disorder, two copies of an abnormal gene must be present in order for the symptoms of the disease to develop.
True
An autosomal recessive disorder is a genetic condition that appears only in individuals who have received two copies of a recessive autosomal gene, one copy from each parent. The parents may be carriers who have only one copy of the gene and do not exhibit the trait. Or they may be affected individuals with two copies of recessive genes.