post vs pre zygote isolation

Pre-zygotic isolation

Mechanisms that prevent fertilization and formation of a zygote.

Post-zygotic isolation

Mechanisms that occur after fertilization, affecting hybrid offspring's viability or fertility.

Temporal isolation

A form of pre-zygotic isolation where species breed at different times.

Habitat isolation

A pre-zygotic isolation mechanism where species live in different habitats.

Behavioral isolation

Pre-zygotic isolation due to different mating rituals or behaviors.

Mechanical isolation

A pre-zygotic mechanism involving differences in reproductive anatomy.

Gametic isolation

A pre-zygotic mechanism where sperm and egg are incompatible.

Hybrid inviability

A post-zygotic isolation mechanism where hybrid offspring do not develop properly.

Hybrid sterility

A post-zygotic mechanism where hybrid offspring are sterile and cannot reproduce.

Hybrid breakdown

A post-zygotic mechanism where hybrid offspring are fertile but their descendants are inviable.

Species boundaries

The concept that maintains distinct species and prevents interbreeding.

Gene flow

The transfer of genetic material between populations, which is prevented by isolation mechanisms.

Zygote

The fertilized egg formed by the union of sperm and egg.

Reproductive isolation

The mechanisms that prevent species from interbreeding.

Fertilization

The union of sperm and egg that leads to zygote formation.