Pedigree Worksheet Biology Worksheet Template printable pdf download

Pedigree Worksheet

Name ____________________________________

= Huntington’s

Disease

III

1. Which members of the family above are afflicted with Huntington’s Disease? _________________________________

2. There are no carriers for Huntington’s Disease- you either have it or you don’t.

With this in mind, is Huntington’s disease caused by a dominant or recessive trait? ____________________________

3. How many children did individuals I-1 and I-2 have? _______________________________________________

4. How many girls did II-1 and II-2 have? ______________ How many have Huntington’s Disease? ________________

5. How are individuals III-2 and II-4 related? ________________________ I-2 and III-5? _________________________

6. The pedigree to the right shows a family’s pedigree

for Hitchhiker’s Thumb. Is this trait

dominant or recessive? _______________________

7. How do you know? _________________________

___________________________________________

8. How are individuals III-1

and III-2 related? ________________________

III

9. How would you name the 2 individuals that

have hitchhiker’s thumb? ___________________

10. Name the 2 individuals that were

carriers of hitchhiker’s thumb. ______________

11. Is it possible for individual IV-2 to be a carrier? ___________ Why? ________________________________________

12. The pedigree to the right shows a family’s pedigree

**half-shaded = carrier of disease

for colorblindness. Which sex can be carriers of

colorblindness and not have it? ______________________

13. With this in mind, what kind of trait is

colorblindness (use your notes)? ______________________

14. Why does individual IV-7 have colorblindness?

_________________________________________________

III

15. Why do all the daughters in generation II carry the

colorblind gene? ____________________________________

16. Name 2 IV generation colorblind males. _________

Pedigree Worksheet Biology Worksheet Template