A nursing student is preparing an oral presentation about autosomal recessive inheritance. What must occur for an offspring to demonstrate signs and symptoms of the disorder with this type of inheritance?
A) Both parents must be heterozygous carriers.
B) One parent must have the disease.
C) The mother must be a carrier.
D) The father must be affected by the disease.
Ans: A
Autosomal recessive inheritance occurs when two copies of the mutant or abnormal gene in the homozygous state are necessary to produce the phenotype. In other words, two abnormal genes are needed for the individual to demonstrate signs and symptoms of the disorder. Both parents of the affected person must be heterozygous carriers of the gene (clinically normal, but carriers of the gene).
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