In autosomal recessive (AR) disorders, individuals need:
A. Only one mutated gene on the sex chromosomes to acquire the disease
B. Only one mutated gene to acquire the disease
C. Two mutated genes to acquire the disease
D. Two mutated genes to become carriers
ANS: C
In autosomal recessive (AR) disorders, the offspring inherits the condition by receiving one copy of the gene mutation from each of the parents. Autosomal recessive disorders must be inherited through both parents (Nussbaum et al. 2007). Individuals who have an AR disorder have two mutated genes, one on each locus of the chromosome. Parents of an affected person are called carriers because each carries one copy of the mutation on one chromosome and a normal gene on the other chromosome. Carriers typically are not affected by the disease.
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