Genetics Worksheet Page 8
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8Section E: Pedigrees
I
1
2
= Huntington’s
Disease
II
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2
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5
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III
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2
3
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1. 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? ___________________
2. How many girls did II-1 and II-2 have? ___________ How many have the disease? ____________
3. If individual III-1 marries someone heterozygous for Huntington’s, then what’s the chance of having a
child with Huntingtons?
4. The pedigree to the right shows the passing on of
colorblindness. What sex can ONLY be carriers of
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colorblindness? __________________________
5. With this in mind, what kind of trait is colorblindness?
II
II
_____________________
6. Is this trait recessive or dominant? ________________
How did you know? ____________________________
III.
II
____________________________________________
II
7. Why do all the daughters in generation II carry the
colorblind gene? ______________________________
IV
____________________________________________
8. If individual IV-1 marries a carrier for colorblindness,
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2
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then what’s the chance they will have a daughter who is colorblind?
Interactive Pedigree:
Quizzes:
8
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