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Magazine Chapter 15: Problem 2
Mutations of the gene for \(\beta\) -globin a. are usually lethal. b. occur only at amino acid position 6 c. number in the hundreds. d. always result in sickling of red blood cells. e. can always be detected by gel electrophoresis.
Short Answer
Expert verified
Option (c) is correct: Mutations number in the hundreds.
Step by step solution
01
Understanding the Question
The exercise asks about the mutations of the gene for \(\beta\)-globin and wants you to choose which statement is correct from the options.
02
Option Analysis - Lethality of Gene Mutations
Option (a) suggests that mutations of the \(\beta\)-globin gene are usually lethal. While severe mutations can be lethal, many mutations lead to milder conditions such as beta-thalassemia or sickle cell disease, neither of which is usually lethal with proper management.
03
Option Analysis - Specific Mutation Location
Option (b) claims mutations occur only at amino acid position 6. This is incorrect, as mutations can occur at various positions in the \(\beta\)-globin gene, including but not limited to position 6.
04
Option Analysis - Mutation Frequency
Option (c) states that mutations number in the hundreds. This is true, as there are many different mutations identified in the \(\beta\)-globin gene.
05
Option Analysis - Result of Mutations
Option (d) asserts that mutations always result in sickling of red blood cells. This is incorrect; not all mutations lead to sickle cell disease. Some may lead to other conditions such as beta-thalassemia.
06
Option Analysis - Detection by Gel Electrophoresis
Option (e) suggests that mutations can always be detected by gel electrophoresis. This is not accurate as some mutations, especially silent ones or small-scale mutations, may not alter the electrophoretic mobility and thus aren't always detectable by this method.
07
Conclusion - Correct Option
The only statement from the options provided that is true is option (c). Therefore, the correct answer is that the mutations of the \(\beta\)-globin gene number in the hundreds.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Sickle Cell Disease
Sickle cell disease is a genetic condition stemming from a specific mutation in the \(\beta\)-globin gene. This mutation causes the production of abnormal hemoglobin known as hemoglobin S. When oxygen levels are low, hemoglobin S can form stiff rods within the red blood cells, changing their usually round shape into a sickle-like shape. These sickled cells can block blood flow through tiny vessels, leading to pain, organ damage, and a risk of serious infections.
Key points about sickle cell disease include:
Key points about sickle cell disease include:
- The mutation typically occurs at the sixth amino acid position where glutamic acid gets replaced by valine.
- It is inherited in an autosomal recessive pattern, meaning a child needs to inherit the mutated gene from both parents to exhibit the disease.
- Management includes hydration, pain management, and in some cases, hydroxyurea or blood transfusions.
Beta-thalassemia
Beta-thalassemia refers to a blood disorder caused by mutations in the \(\beta\)-globin gene that lead to reduced or absent production of beta-globin chains. These chains are components of hemoglobin, the protein in red blood cells that carries oxygen throughout the body.
There are several types of beta-thalassemia, each with varying degrees of severity:
There are several types of beta-thalassemia, each with varying degrees of severity:
- Beta-thalassemia minor (carrier state): Usually does not cause severe symptoms but can result in mild anemia.
- Beta-thalassemia intermedia: Can cause moderate to severe anemia and other health issues.
- Beta-thalassemia major (Cooley's anemia): Often leads to life-threatening anemia requiring regular blood transfusions.
Genetic Mutation Detection
Genetic mutation detection is a key aspect of understanding and managing conditions like sickle cell disease and beta-thalassemia. Various methods are employed to detect mutations in the \(\beta\)-globin gene, providing critical information for diagnosis and treatment planning.
Some common techniques include:
Some common techniques include:
- PCR (Polymerase Chain Reaction): Amplifies specific DNA sequences, making it easier to analyze mutations in a gene of interest.
- Gel Electrophoresis: Separates DNA fragments by size; however, not all mutations change the fragment size significantly enough to be detected by this method.
- DNA Sequencing: Allows precise identification of nucleotide changes in the gene, offering detailed information about mutations.
