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Introduction:
Scientists study family history using a diagram that traces inheritance of a particular trait through several generations. Such diagrams are called pedigree. A pedigree uses symbols to illustrate the inheritance of trait. By analyzing the pedigree we can infer the genotypes by observing the
Answer to Problem 5A
Correct answer :
The correct answer is option D. Huntington’s disease
Explanation of Solution
Explanation/justification for the correct answer:
Option D. Huntington’s disease - The given pedigree illustrates inheritance of a rare genetic disorder. In this diagram, some express the disease and some do not have the disease. There are no circles or squares which are half filled; so there are no carriers of the disease. Hence we can say that the disorder is a dominant genetic disorder because a recessive genetic disorder will have a carrier. Amongst the diseases given only Huntington’s disease is a dominant genetic disease. The other three are recessive genetic disorders.
Hence this is the correct option.
Explanation for incorrect answer:
Option A. cystic fibrosis- It is a recessive genetic disorder. Since the given pedigree does not show any carrier of the disease, it may be concluded that the pedigree shows a dominant genetic disorder. Hence this is not the correct option.
Option B. albinism- It is a recessive genetic disorder. Since the given pedigree does not show any carrier of the disease, it may be concluded that the pedigree shows a dominant genetic disorder. Hence this is not the correct option.
Option C. Tay-Sachs disease- It is a recessive genetic disorder. Since the given pedigree does not show any carrier of the disease, it may be concluded that the pedigree shows a dominant genetic disorder. Hence this is not the correct option.
Chapter 11 Solutions
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