1. a) autosomal dominant
2. Evidence: The trait appears in every generation, and affected individuals have at least one affected parent.
3. Autosomal recessive
4. Evidence: The trait skips generations and appears in siblings without appearing in parents; more males are affected than females, suggesting X-linked inheritance is also possible, but the pattern fits autosomal recessive best given unaffected parents having affected children.
5. Autosomal recessive
6. Evidence: Unaffected parents (II-3 and II-4) have an affected child (III-2), which is only possible with recessive inheritance.
7. Autosomal dominant
8. Evidence: Affected individuals appear in every generation, and each affected individual has at least one affected parent.
9. Autosomal recessive
10. Evidence: Unaffected parents (II-1 and II-2) have an affected child (III-1), indicating the trait is recessive.
11. Autosomal dominant
12. Evidence: The trait appears in every generation, and affected individuals have at least one affected parent; no skipping of generations.
Parent Tip: Review the logic above to help your child master the concept of pedigree analysis worksheet.
