Introduction
Mutations are an essential part of evolution and genetic diversity, but they can also cause diseases and developmental problems. A mutation is a change in the DNA sequence, and these changes influence how organisms grow, function, and adapt to their environment (Griffiths et al., 2019). By studying mutations, scientists gain a better understanding of how genomes change over time and how these changes affect biology and medicine.
In this learning unit, students explore different types of mutations, including chromosomal changes such as deletions, duplications, inversions, and translocations. These mutations can alter the structure of chromosomes and influence how genes work (Alberts et al., 2015). The unit also explains how mutations can arise from errors during DNA replication, when DNA is copied before cell division, as well as from environmental factors such as ultraviolet (UV) radiation and chemical substances (Strachan & Read, 2018).
In addition, the unit highlights the importance of DNA repair mechanisms. Cells have systems that correct many DNA errors, helping to protect genome stability. However, repair processes are not always perfect, and some mutations remain in the DNA, increasing genetic variation within populations (National Human Genome Research Institute, 2023). This balance between maintaining genome integrity and allowing genetic variation is crucial for both the survival of organisms and the process of evolution.
