What does genetic variation refer to?

Genetic variation refers to the differences in DNA sequences among individuals within a population. This diversity is crucial for the process of evolution and can manifest in various forms, such as differences in alleles, gene mutations, and chromosomal variations. Genetic variation provides the raw material for natural selection to act upon, allowing populations to adapt to changing environments, resist diseases, and improve survival rates over generations.

By understanding that genetic variation encompasses the unique aspects of DNA among individuals, it becomes clear why this option is the most accurate representation of the concept. The other options imply uniformity or fixed sequences, which fail to capture the essence of genetic diversity essential for evolution and adaptation.