Postzygotic Isolation

Definition

Postzygotic isolation refers to mechanisms that prevent successful development and reproduction after fertilization has occurred between members of different species.

Related terms

Hybrid Inviability: When hybrids fail to develop or reach sexual maturity due to genetic incompatibility between the parent species.

Hybrid Sterility: When hybrids are viable but cannot produce offspring due their inability to produce normal gametes.

Hybrid Breakdown: When first-generation hybrids are viable and fertile, but when they mate with another species or with either parent species, their offspring are feeble or sterile.