Genetic testing identifies changes in what?

Genetic testing identifies changes in what?

• A. Cell membrane permeability.
• B. Chromosomes, genes, or proteins.
• C. Blood pressure and heart rate.
• D. Metabolic energy production.

Answer: (B)

Genetic testing is used to detect alterations in the genetic material or its direct products. It looks for changes in chromosomes, in specific genes, or in the proteins encoded by those genes. For example, chromosomal changes like extra copies or missing segments, gene mutations that alter function, or abnormal protein variants can indicate a genetic condition or carrier status. This distinguishes it from measuring physical traits or cellular functions, such as how readily a cell membrane lets substances through, which is a physiological property rather than a genetic change. It also isn’t about whole-body measurements like blood pressure or heart rate, or about energy production directly, which are influenced by many factors beyond the genome. Therefore, identifying changes in chromosomes, genes, or proteins captures what genetic testing is designed to reveal.

Genetic testing is used to detect alterations in the genetic material or its direct products. It looks for changes in chromosomes, in specific genes, or in the proteins encoded by those genes. For example, chromosomal changes like extra copies or missing segments, gene mutations that alter function, or abnormal protein variants can indicate a genetic condition or carrier status. This distinguishes it from measuring physical traits or cellular functions, such as how readily a cell membrane lets substances through, which is a physiological property rather than a genetic change. It also isn’t about whole-body measurements like blood pressure or heart rate, or about energy production directly, which are influenced by many factors beyond the genome. Therefore, identifying changes in chromosomes, genes, or proteins captures what genetic testing is designed to reveal.