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In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

1. X-linked recessive
2. Autosomal recessive
3. X-linked dominant
4. Autosomal dominant

Correct answer: Autosomal recessive

Solution

Autosomal recessive traits often appear in unaffected carrier parents who have affected offspring, and they can skip generations. If males and females are affected similarly, that supports an autosomal rather than X-linked pattern.

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