What is a biotype in the context of species differentiation?

A biotype refers to a specific group of organisms within a species that exhibit distinct hereditary traits. This concept is essential for understanding variations within a species, as it highlights the genetic diversity that can exist among organisms that are otherwise classified under the same species. Biotypes can arise due to adaptations to different environments, selective pressures, or varying ecological niches, leading to differences in traits such as morphology, behavior, or resistance to diseases.

In this context, the other choices do not capture the accurate definition of a biotype. For instance, classifying organisms solely based on geographic location does not consider the genetic differences that define biotypes. Similarly, genetically modified organisms are altered through human intervention and are not representative of natural hereditary diversity within a species. Lastly, a physical variation without genetic influence contradicts the essence of what a biotype is, as biotypes are inherently linked to genetic factors that contribute to the distinct traits observed.