MCAD deficiency is
a disorder that is inherited in an autosomal recessive pattern. That
means that both girls and boys can inherit the disorder (automsomal) and
that one only has the disorder if both copies of the gene on the pair of chromosomes
(also called alleles) have the mutation (recessive).
autosomal recessive inheritance of a disorder, both parents have each
one mutation, and the patient received from both parents the mutated
The parents are carriers.
one normal gene and one mutated gene, and that is why they don't have
any symptoms of the disorder.
is also possible that a mutation is newly created in the sperm cell or
egg cell from which the baby originated. In that case the baby has the
disorder and can pass it on to his or her children. But the parent is
not a carrier.