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The gradualism model of evolution states that change occurs gradually over time. On the other hand, the punctuated equilibrium model states that change occurs suddenly or rapidly.
Evolution happens over a long period of time, so nothing suddenly changes. Unless you're talking about pokemon. I believe you're thinking of divergent evolution.
Genetic mutation does not always lead to sterilization as you point out. This however is not the way evolution happens. Evolution occurs mainly through small adaptive changes over a long period of time that are not mutations. Evolution does not happen suddenly.
The cast of Suddenly an Eagle - 1976 includes: Kenneth Griffith as British Narrator
I was awed by the full complement of nurses that suddenly appeared.
a greater chance to survive if the environmental conditions suddenly change.
The cast of Suddenly Among Strangers - 1981 includes: Robert Powell as Himself - Commentator
i suppose that ffrogs and toads appear after rain because they like the mud and the environmental change
It was a great afternoon, a cow suddenly appeared and ran toward a treeWas greatIT WAS A CLEAR NIGHT WHEN SUDDENLY A COW FELL FROM THE SKYwas, clear
Eat your computer
The butler appeared suddenly, seeming to materialize out of nowhere.
Because it disproves evolution. Lots of fossils suddenly appearing of fully formed animals. Points to the creator God.