This document discusses different patterns of genetic inheritance - autosomal dominant, autosomal recessive, X-linked dominant, and X-linked recessive. It determines that the given example is autosomal recessive, as two unaffected parents could have an affected offspring if they each contribute one mutated gene, requiring two mutated genes for the disorder. Autosomal recessive disorders are commonly passed on by two carrier parents to their children.

1. What is this pedigree and example of? Autosomal dominant autosomal recessive X-linked
dominant X-linked recessive
Solution
This is a case of Autosomal recessive. Cannot be dominant as two unaffected parents could have
affected offspring as they inherit two mutated genes, one from each parent. These disorders are
usually passed on by two carriers. For example cystic fibrosis
Autosomal dominant: can't be possible as affected parents cannot have unaffected offsprings.
X-linked recessive: affected sons result from affected mother.
X-linked dominant: affected daughters result from affected father.