Post zygotic barriers
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Most hybrid offspring not surviving, or if they do, they are very frail
Reduced hybrid variability
Hybrid offspring reach maturity and be healthy but sterile
Reduced hybrid fertility
1st generation of hybrid offspring viable and fertile, but when these hybrids meet with one another or parent species, the offspring are feeble or sterile or
Allopatric speciation includes populations that are separated by what
Geographical barriers (Mountain ranges, rivers, lakes, canyons, ECT.)
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