What term describes a specific DNA sequence that is linked to a certain trait?

• A. Gene therapy
• B. Genetic drift
• C. Genetic marker
• D. Phenotype

Answer: (C)

The term "genetic marker" refers to a specific DNA sequence that is associated with a particular trait or phenotype. These markers are crucial in genetic research and biotechnological applications because they help in identifying the presence of specific traits in organisms, including humans, plants, and animals. Genetic markers can be genes themselves, or they can be non-coding DNA sequences that are located close to a gene of interest. When certain genetic markers are found, researchers can infer the likelihood of developing associated traits, aiding in studies such as inheritance patterns and genetic predispositions to diseases.

The other options, while related to genetics, do not specifically describe a DNA sequence linked to a trait. Gene therapy refers to the technique of altering genes to treat or prevent disease, genetic drift describes the change in the frequency of an existing gene variant in a population due to random sampling, and phenotype refers to the observable characteristics of an organism as influenced by its genotype and environment. None of these directly answer the question regarding a specific DNA sequence linked to a certain trait.