What is a mutation?

• A. A change in the DNA sequence
• B. A process of cell division
• C. A type of cellular respiration
• D. An increase in genetic variation

Answer: (A)

A mutation is defined as a change in the DNA sequence. This alteration can occur in various forms, including point mutations, insertions, deletions, and duplications, which can all affect the genetic code of an organism. Mutations can arise from various sources, such as errors during DNA replication, exposure to certain chemicals or radiation, and even viral infections.

The significance of mutations lies in their ability to introduce genetic diversity within a population, influencing evolution and adaptation over time. While options discussing processes like cell division, cellular respiration, and genetic variation have important roles in biology, only the option regarding a change in the DNA sequence accurately captures the fundamental definition of a mutation. This understanding is critical as mutations can lead to various outcomes, such as benign, beneficial, or deleterious effects on an organism's phenotype or overall health.