Creatures that are not the same species, but close, can only produce offspring that are sterile. Horse and donkey=Mule. You ever see a thoroughbred mule?
If you buy garden hybrid garden seeds they produce great crops, but the seeds will not reproduce themselves. There is usually a warning on the package telling you this.
Some people will buy and plant hybrid corn getting a great crop, then plant the seeds and expect the same The stalk may come up but the ear of corn is a failure.
I’m not sure when that idea was taught but it was never true. Gregor Mendel for instance became famous for proposing speciation by hybridization.
“Some people will buy and plant hybrid corn getting a great crop, then plant the seeds and expect the same The stalk may come up but the ear of corn is a failure.”
Correct, must use heirloom seeds to reproduce.