What is genetic variation?

Genetic variation refers to the differences in DNA sequences among individuals within a population. These variations can be due to several factors, such as mutations, gene shuffling during reproduction, and other genetic mechanisms. Because of these differences, individuals can exhibit a wide range of traits, such as variations in physical characteristics, susceptibility to diseases, and other phenotypic expressions.

This concept is crucial for evolution and natural selection, as genetic diversity provides the raw material for populations to adapt to changing environments. Without genetic variation, a population could be vulnerable to extinction since all members would potentially respond similarly to environmental changes or diseases. Therefore, option B accurately captures the essence of genetic variation as it highlights the role of differing DNA sequences in generating diverse traits among individuals.