When members of populations do not mate with each other or cannot produce fertile offspring, they are Blank______.Multiple choice question.undergoing speciationexperiencing gene flowreproductively isolatedundergoing anagenesis

If two species that have evolved over time to be completely reproductively isolated suddenly come into contact with one another, they will likely Blank______.Multiple choice question.remain distinct specieshybridize, forming a third specieshybridize, initiating gene flow and homogenizing the gene pools

If two reproductively isolated populations re-establish contact, Blank______ will tend to increase differences between the populations, and Blank______ will tend to decrease differences between the populations.Multiple choice question.hybrid infertility; hybrid inviabilityhybrid inviability; hybrid infertilityreinforcement; gene flowgene flow; reinforcement

If two distinct populations that have not evolved independently for a long enough time to be completely reproductively isolated come into physical contact with one another, they Blank______.Multiple choice question.will experience gene flow, but will remain two distinct specieswill experience gene flow, which will homogenize them, causing them to integrate into one specieswill experience gene flow, but will remain two distinct subspecieswill not experience gene flow, so will remain two distinct species

The formation of fertile hybrids in artificial settings is not sufficient evidence to define a species because Blank______.Multiple choice question.it doesn't take into account the effects of gene flowonly a small percentage of individuals can hybridize in artificial settingsit may not occur in a natural setting

If two populations that are geographically distant from one another regularly experience gene flow (ex: through migration), those populations are most likely Blank______.Multiple choice question.the same speciestwo different speciesthe same subspecies, but not the same species