Gametic barrier

Definition

Gametic barrier is a prezygotic reproductive isolation mechanism where sperm from one species cannot fertilize the eggs of another species. This can occur due to incompatibility in gamete recognition or biochemical differences.

5 Must Know Facts For Your Next Test

1. Gametic barriers prevent interspecies breeding and maintain species integrity.
2. Common examples include incompatible receptors on egg and sperm surfaces.
3. These barriers contribute to speciation by preventing gene flow between populations.
4. Gametic isolation is often observed in sea urchins, where different species release gametes into the water.
5. This mechanism is crucial in environments where multiple closely-related species coexist.

Review Questions

• What role do gametic barriers play in the process of speciation?
• Can you provide an example of a species that exhibits gametic isolation?
• How do gametic barriers contribute to maintaining species boundaries?

Related terms

Prezygotic Isolation: Mechanisms that prevent mating or fertilization between different species.

Postzygotic Isolation: Reproductive barriers that occur after fertilization, leading to hybrid inviability or sterility.

Speciation: The evolutionary process through which new biological species arise.