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Chapter 25: Problem 3

Many genetic disorders exhibit locus heterogeneity. Define and give two examples of locus heterogeneity. How does locus heterogeneity confound a pedigree analysis?

Short Answer

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Locus heterogeneity refers to the phenomenon where the same disease can be caused by mutations in different genes. Examples of locus heterogeneity include Retinitis pigementosa and Osteogenesis imperfecta, where several identified genes can cause the conditions. Locus heterogeneity makes pedigree analysis challenging, as the same phenotypes can originate from different genes, potentially leading to miscalculations when predicting inheritance patterns and risks.

Step by step solution

01

Understanding Locus Heterogeneity

Locus heterogeneity refers to the observation that a similar phenotype (observable traits) can result from mutations at different genetic loci (locations on a chromosome). In other words, different genes can cause the same disease.
02

Providing Examples of Locus Heterogeneity

Example 1: Retinitis pigementosa is a genetic disorder that can results in progressive degeneration of the retina. It is a clear example of locus heterogeneity, as more than 60 genes have been identified that when mutated can cause the disease. \n Example 2: Osteogenesis imperfecta, also known as brittle bone disease, is another example. It is mainly caused by mutations in two genes (COL1A1 and COL1A2), but mutations in other genes can also cause the disease.
03

Explaining Impacts on Pedigree Analysis

Locus heterogeneity complicates pedigree analysis because it makes it difficult to determine what specific gene is responsible for a disorder. For example, one family member may have a mutation at one locus, while another has a mutation at a different locus 鈥� even though they may have the same observed phenotype. This can lead to inaccurate predictions about inheritance patterns and risks.

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Most popular questions from this chapter

With regard to cancer cells, which of the following statements are true? A. Cancer cells are clonal, which means they are derived from a single mutant cell. B. To become cancerous, cells usually accumulate multiple genetic changes that eventually result in uncontrolled growth. C. Most cancers are caused by oncogenic viruses. D. Cancer cells have lost the ability to properly regulate cell division.

A p53 knockout mouse in which both copies of \(p 53\) are defective has been produced by researchers. This type of mouse appears normal at birth. However, it is highly sensitive to UV light. Based on your knowledge of \(p 53\), explain the normal appearance at birth and the high sensitivity to UV light.

What is a prion? Explain how a prion relies on normal cellular proteins to cause a disease such as mad cow disease.

A genetic predisposition to developing cancer is usually inherited as a dominant trait. At the level of cellular function, are the alleles involved actually dominant? Explain why some individuals who have inherited these dominant alleles do not develop cancer during their lifetimes.

In general, why do changes in chromosome structure or number tend to affect an individual's phenotype? Explain why some changes in chromosome structure, such as reciprocal translocations, do not.
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