1. I-1, II-2, II-3, II-7, III-3, IV-1, IV-3, IV-5, IV-6, IV-7, IV-8
2. Dominant
3. 8
4. 3; 2
5. Cousins; Grandparent and grandchild
6. Dominant
7. Affected individuals have at least one affected parent; trait does not skip generations
8. Siblings
9. IV-1 and IV-3
10. III-1 and III-2
11. No; Hitchhiker’s thumb is dominant, so unaffected individuals cannot be carriers
12. Females
13. X-linked recessive
14. Inherited the recessive allele from his carrier mother (II-6) and his father (II-5) was colorblind
15. Their father (I-1) was colorblind and passed his X chromosome with the recessive allele to all his daughters
16. IV-1, IV-5, IV-6, IV-8
Parent Tip: Review the logic above to help your child master the concept of human pedigree worksheets.
