Thanks for that input. So, the next generation is sterile. This is the sort of thing we see as a genetic wall that would make evolution impossible. This is seen when trying to produce hybrid species in an attempt to make animals that would be superior alternatives to existing animals...... They can only go so far and then they hit the wall.
That's not how evolution works. "Superior alternatives" come about through mutations which are passed on to immediate descendants. Each generation of lion is fertile with the next, and they pass on new mutations each and every generation. No wall.
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