Pedigree Worksheet Name ____________________________________ I II 1 2 1 2 4 5 = Huntington’s Disease 3 6 7 8 III 1 2 3 4 5 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? _______________________ I 1 7. How do you know? _________________________ ___________________________________________ II 1 8. How are individuals III-4 and III-5 related? ________________________ 10. Name the 2 individuals that were carriers of hitchhiker’s thumb. ______________ 3 1 IV 3 2 III 2 4 11. Is it possible for individual IV-3 to be a carrier? ___________ Why? ________________________________________ 6 4 5 2 1 5 2 6 4 3 12. Brown eyes are a dominant eye-color allele and blue eyes are recessive. A brown-eyed woman whose father had blue eyes and whose mother had brown eyes marries a brown-eyed man whose parents are also brown-eyed. They have a son who is blue-eyed. Please draw a pedigree showing all four grandparents, the two parents, and the son. Indicate which individuals for which you are certain of their genotype and also not all genotypes possible if you cannot determine a single combination of alleles. 7 A B 13. Analyze the pedigrees above. For both pedigrees (A and B), determine if the shaded individuals possess the dominant or recessive trait. 14. To the right is a pedigree for an inherited heart disease. What is the probability that their child F would have the inherited heart disease? 15. To the right is a pedigree for myopia or nearsightedness. Predict if the disorder is inherited as a result of a dominant or a recessive allele. Afflicted individuals are indicated by black symbols, unaffected by white. Determine the most probable genotype for each individual based on your previous prediction.

Biol Pedigree Worksheet

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