What is a hybrid zone?

A hybrid zone refers specifically to a geographical region where individuals from different species or distinct populations intersect and interbreed, producing hybrids. This definition underscores the importance of reproductive interaction between these distinct groups. In a hybrid zone, the genetic exchange that occurs can lead to unique combinations of traits and can help researchers understand the processes of speciation and the dynamics of evolution.

The presence of hybrids can also indicate the degree of genetic divergence between the parent species and can inform studies in areas such as conservation biology, where maintaining the integrity of distinct species may be a concern. In contrast, the other options do not accurately reflect the defining characteristics of a hybrid zone: areas where species no longer mate would not encompass hybridization, regions of high genetic variation do not specifically relate to interbreeding between different species, and distinct geographic barriers suggest isolation rather than a zone of interaction.