The following pedigree shows inheritance of Huntington's disease, a fatal genetic disorder that causes neurodegeneration. Since signs and symptoms usually do not appear until adulthood, many who are carriers may not realize their risk of passing a the disease-causing allele. The following pedigree represents a family in which some people are affected by Huntington's disease. Reeesslve Trait pically రాంి m Domin
The following pedigree shows inheritance of Huntington's disease, a fatal genetic disorder that causes neurodegeneration. Since signs and symptoms usually do not appear until adulthood, many who are carriers may not realize their risk of passing a the disease-causing allele. The following pedigree represents a family in which some people are affected by Huntington's disease. Reeesslve Trait pically రాంి m Domin
Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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
Transcribed Image Text:**Pedigree and Inheritance of Huntington's Disease**
The following pedigree illustrates the inheritance pattern of Huntington's disease, a fatal genetic disorder characterized by neurodegeneration. As the signs and symptoms often do not manifest until adulthood, carriers may unknowingly pass on the disease-causing allele. The pedigree below reflects a family with members affected by Huntington's disease.
**Key Features of the Pedigrees:**
(a) *Autosomal Recessive Trait*
- The diagram displays a typical autosomal recessive inheritance pattern, where individuals must inherit two copies of the recessive allele to express the trait.
- Important notes in the diagram:
- Either I-2 or I-4 must be heterozygous.
- Recessive traits often skip generations.
- Recessive patterns generally show up only when both parents carry the recessive allele.
(b) *Autosomal Dominant Trait*
- This portion shows an autosomal dominant trait, where only one copy of the allele is needed to express the disorder.
- Important notes in the diagram:
- I-1 is heterozygous for the dominant allele.
- Dominant traits seldom skip generations, with affected individuals appearing in each generation.
- Every affected individual possesses at least one affected parent.
- Affected individuals will all have the dominant allele.
- The dominant allele displays readily in both sexes across generations.
These diagrams illustrate genetic inheritance patterns crucial for understanding Huntington’s disease in families.

Transcribed Image Text:a. Using just the information on this pedigree, is Huntington's disease caused by a dominant allele or recessive alleles?
b. What are the genotypes of the grandparents (I-1 and I-2)?
c. What are the genotypes of the parents (II-6 and II-7)?
d. If the parents above have another child, what is the chance that they will be affected by the Huntington’s disease allele?
e. What are the genotypes of the unaffected children (III-8, 9, 10)?
f. What is the chance that the unaffected children above will pass on a Huntington’s disease allele to their children?
g. What is the genotype of the affected child (III-11)?
h. What is the chance that the affected child above will pass on the Huntington’s disease allele to a child?
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