Which of the following reflects genetic variation in a population?

The correct answer is rooted in the concept of genetic variation, which refers to the differences in genes among individuals within a population. Heterogeneity describes the presence of diverse genetic variations and traits within a population, highlighting how individuals can differ genetically. This genetic diversity is crucial for natural selection and can lead to a population's ability to adapt to changing environments.

In contrast, stability implies a certain consistency within a population, suggesting that there is little to no variation in genetic traits. Adaptation refers to the process through which a population becomes better suited to its environment, which is a result of genetic variation but does not directly reflect the variation itself. Uniformity indicates a lack of diversity, suggesting that individuals in a population have similar genetic makeups, thus failing to represent the concept of genetic variation effectively. Therefore, heterogeneity is the best choice as it directly denotes the differences in genetic traits that define genetic variation in a population.