You must inherit two altered genes (mutations), one from each parent, in order to have an autosomal recessive condition. Two carriers typically transmit these diseases on to their offspring.
Recessive genes are thought to be inherited in either an X-linked or autosomal recessive fashion. Disease could arise if the faulty gene is present in two copies. A dominant hereditary condition results, however, if only one aberrant gene is required to cause a disease.
A recessive hereditary characteristic, such as a smooth chin as opposed to a dominant cleft chin, is only expressed in individuals with an aa genotype; hence, offspring must have one recessive allele from each parent to exhibit a recessive trait.
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