Practice question

Prezygotic barriers prevent mating or fertilization before zygote formation, including habitat isolation occupying different microhabitats, temporal isolation breeding at different times or seasons, behavioral isolation with distinct courtship rituals, mechanical isolation with incompatible genitalia, and gametic isolation where sperm and egg fail to fuse. These conserve reproductive effort. Example differing breeding seasons in frogs illustrates temporal isolation. Hence mechanism Premating isolation represents prezygotic reproductive isolation. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.