What can be defined as the field that deals with any genetic condition that occurs due to changes in the nucleotide sequence of DNA representing a gene?

Appeared in: WCL Staff Nurse - 2022

Explanation

Molecular genetics is the branch of biology that studies the structure and function of genes at a molecular level.
This field directly investigates how changes (mutations) in the nucleotide sequence of DNA cause genetic disorders.
It provides the foundational knowledge for understanding the link between a specific gene's DNA code and the resulting health condition, which is the core of the question.

Option A: This field studies how genetic variations affect a person's response to drugs, not the origin of genetic diseases themselves.
Option B: This field focuses on the genetics of somatic (non-reproductive) cells, often related to acquired conditions like cancer, rather than inherited genetic disorders passed through generations.
Option C: This field studies the frequency and distribution of genes and alleles within entire populations, not the molecular basis of disease in an individual.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definitions of different fields in genetics as background academic context rather than a clinical decision trigger.
Nurses use principles of molecular genetics to educate patients and families about genetic testing for conditions like cystic fibrosis, Huntington's disease, or hereditary cancers.
Understanding the molecular basis of a disease is crucial for administering and monitoring targeted therapies, such as specific drugs that only work on cancers with certain genetic mutations (e.g., HER2 inhibitors in breast cancer).
A nurse's role includes providing support and resources for genetic counseling, helping patients navigate the implications of their genetic information.

How to Approach the Question

First, identify the key concept in the question stem: a field linking 'changes in nucleotide sequence' to a 'genetic condition'.
Recognize that 'nucleotide sequence' refers to the most fundamental, or molecular, level of a gene.
Evaluate each option against this core concept.
Eliminate 'Pharmacogenetics' as it relates to drugs, not the cause of the disease itself.
Eliminate 'Population Genetics' as it deals with large groups, not individual molecular changes.
Eliminate 'Somatic Cell Genetics' as it typically deals with non-inherited mutations (like in cancer).

Concept Tested & Keywords

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 187-189

E6 Medicine Harrison 22e Part 2 p. 1681-1683

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Attempt every question from this paper in a timed mock, then review the full solution for each one.