How do postzygotic barriers impede gene flow between species?
i know the two different species mate and produce a hybrid but how exactly does this mechanism PREVENT gene flow between the 2 species (biological species concept)
- JazSincLv 72 months ago
LOL. When does postzygotic stop and prezygotic begin? Ha ha ha.
Okay. When you're looking at "postzygotic" you can start with:
o The embryo fails to develop and dies.
o The mother fails to give birth. (Someone asked about female chihuahua x male great dane. Great Dane puppies are too big for a female Chihuahua to give natural birth to. She dies, and so do the puppies. You can imagine other versions of that with other animals.)
o The baby hybrid animal is ugly or misbehaving and the parent(s) reject it.
o The baby hybrid animal is clumsy and can't keep up with mom's herd.
=== and here is the dividing line between postzygotic and prezygotic ===
The hybrid doesn't dance the right dance or sing the right songs, and is not selected as a mate.
The hybrid is ugly and is not selected as a mate.
The hybrid has greatly reduced fertility, ...