3. Tay-Sachs (Recessive)
- Affected individuals (shaded): tt
- Unaffected parents of affected children: Tt (carriers)
- Unaffected individuals with no affected offspring or known carrier status: TT or Tt (if they have an affected child, they must be Tt; if not, they could be TT or Tt, but without more info, we assume TT unless required to be carriers)
4. Cystic Fibrosis (Recessive)
- FF = normal
- Ff = carrier
- ff = disease
5. Sickle Cell Disease (Recessive)
- AA = normal
- Aa = carrier
- aa = sickle cell disease
Parent Tip: Review the logic above to help your child master the concept of pedigree analysis worksheet.