in cystic fibrosis, two unaffected carriers can have a child with the disease. it is as common in boys as in girls. this disease is autosomal recessive.
Using autosomal recessive inheritance, a genetic disorder or trait can be passed from parent to offspring. When a child receives one copy of a mutant (changed) gene from each parent, a genetic disease may result. A child with an autosomal recessive disease typically does not have affected parents.
The most prevalent hereditary autosomal recessive disease in the Caucasian population is cystic fibrosis.
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