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Rate of Evolution & Mechanism of Speciation

Across
A hybrid individual develops but either dies before birth or if born alive, cannot survive maturity.
Long periods of stability followed by short periods of rapid change.
Occurs when physical barriers such as land or water formations prevent mating.
Prevents the formation of fertile offspring.
Change in species is slow and steady.
Occurs when physical barriers such as land or water formations prevent mating.
Down
Obstacle to mating or to fertilization if mating occurs.
Two populations do not exchange alleles because they do not respond to each others mating rituals.
Hybrid offspring remain healthy and viable but are sterile.
Two populations do not exchange alleles because they are only available to exchange alleles at different times of year or even of the day.
The formation of a new species.