University:
Abraham Baldwin Agricultural College
Course:
BIOL3200K | Genetics
Academic year:

2019
Views:

315

Pages:

2
Author:

Arturo V

Pedigree Worksheet Name _______________________ I II 1 2 1 2 4 5 3 = Huntington’s Disease 6 7 8 III 1 2 3 4 5 I-1 , II-2,7 III-3 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. Dominant With this in mind, is Huntington’s disease caused by a dominant or recessive trait? ____________________________ 6 3. How many children did individuals I-1 and I-2 have? _______________________________________________ 2 4. How many girls did II-1 and II-2 have? ______________ How many have Huntington’s Disease? ________________ 1 Grandmother and grandson niece and uncle 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 Recessive dominant or recessive? _______________________ I Unaffected parents III-1and III-2 7. How do you know? _________________________ ___________________________________________ have affected children 1 2 1 2 II 8. How are individuals III-1 Couple and III-2 related? ________________________ 9. How would you name the 2 individuals that have hitchhiker’s thumb? ___________________ IV-1 IV-3 III 3 1 4 2 3 4 IV 10. Name the 2 individuals that were carriers of hitchhiker’s thumb. ______________ III-1 III-2 1 2 3 She could have received the recessive allele from either Yes parent 11. Is it possible for individual IV-2 to be a carrier? ___________ Why? ________________________________________ 12. The pedigree to the right shows a family’s pedigree for colorblindness. Which sex can be carriers of recessive colorblindness and not have it? ______________________ 13. With this in mind, what kind of trait is II Sex linked and recessive colorblindness (use your notes)? ______________________ 14. Why does individual IV-7 have colorblindness? She received a recessive allele from each parents _________________________________________________ 1 IV-1 and IV-5 **half-shaded = carrier of disease 2 2 1 2 1 2 5 4 3 1 III 15. Why do all the daughters in generation II carry the colorblind gene? ____________________________________ Dad is colorblind, so they all receive the recessive allele form him IV 16. Name 2 IV generation colorblind males. _________ 1 I 2 3 3 3 4 5 6 7 5 6 7 8 6 7 8 4 4 7 6 5 8 Name ____________________________________ aa I 1 2 3 Aa Aa 4 5 6 Aa II 1 2 3 4 III 1 2 3 aa 4 aa 5 5 6 7 8 6 7 9 8 17. Identify the genotypes of the following individuals using the pedigree above. Use the letters A,a aa-homozygous recessive aa-homozygous recessive c. I-1: ____________________________________ a. III-3: ___________________________________ Aa-heterozygous Aa - heterozygous b. II-1: ____________________________________ d. II-4: ____________________________________