Kami Export - Doan Trang Le - Pedigree worksheet PDF

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Doan Trang Le Name ____________________________________

Pedigree Worksheet

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= Huntington’s Disease 6

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

6. The pedigree to the right shows a family’s pedigree for Hitchhiker’s Thumb. Is this trait Recessive dominant or recessive? _______________________

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Unaffected parents III-1and III-2 7. How do you know? _________________________ ___________________________________________ have affected children

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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

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10. Name the 2 individuals that were carriers of hitchhiker’s thumb. ______________ III-1 III-2

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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? ______________________

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13. With this in mind, what kind of trait is II Sex linked and recessive colorblindness (use your notes)? ______________________

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14. Why does individual IV-7 have colorblindness? She received a recessive allele from each parents _________________________________________________

15. Why do all the daughters in generation II carry the colorblind gene? ____________________________________ Dad is colorblind, so they all receive the recessive allele form himIV

16. Name 2 IV generation colorblind males. _________ IV-1 and IV-5

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**half-shaded = carrier of disease

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Name ____________________________________ aa

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17. Identify the genotypes of the following individuals using the pedigree above. Use the letters A,a aa-homozygous recessive aa-homozygous recessive a. III-3: ___________________________________ c. I-1: ____________________________________ Aa-heterozygous Aa - heterozygous b. II-1: ____________________________________ d. II-4: ____________________________________...