reproductive isolation

This term is a technical biological concept used primarily in evolutionary biology and ecology. It describes the mechanisms that prevent members of different species from producing offspring, or ensure that any offspring produced are sterile. It is the fundamental driver of speciation, as it allows populations to evolve independently.

In a scientific context, this is often categorized into pre-zygotic barriers, which prevent fertilization from occurring, and post-zygotic barriers, which affect the viability or fertility of the hybrid offspring. Because it describes a biological state or process, it is treated as an uncountable noun and is not used in the plural.