Colorado Twin Registry

Please read the following paper and answer the questions to the right.
Colorado Twin Registry

Please Download and read the following paper which is a follow up to the original
Colorado Twin Registry Update

Which Twin Samples went on to participate in the CADD?
1. CTS (Community Twin Sample) only
2. CTS & LTS (Longitudinal Twin Sample)
3. ITS (Infant Twin Sample) & LTS
4. CTS & ITS
5. CTS, LTS & ERDS
How was zygosity originally determined?
1. Tester ratings on a zygosity questionnaire based on Nichols and Bilbro (1966).
2. Parent ratings on a zygosity questionnaire based on Nichols and Bilbro (1966).
3. Twin concordance among 11 STR polymorphisms
1000 pairs of Community Twins were enrolled in the CADD. What was the age requirement for enrollment?
1. 12 - 16
2. 16 - 20
3. 12 - 18
4. 16 - 18