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Allopatric speciation
________ has been observed in nature, according to field research.
Natural selection
________ resulted in divergent evolution after one year (approximately 40 generations): populations reared on starch digested starch more effectively, whereas populations raised on maltose digested maltose more efficiently.
Gene flow
________ between the Atlantic and Pacific populations of Mexico might have occurred prior to the formation of the isthmus.
single barrier
Although a(n) ________ can not block complete gene flow, a collection of obstacles can successfully isolate a species 'gene pool.
reproductive compatibility
Because biological species are characterized by ________, the emergence of a new species is dependent on reproductive isolation- the presence of biological characteristics (barriers) that prevent individuals of two species from interbreeding and generating viable, fruitful offspring.
biological species idea
The ________ places a premium on reproductive isolation.
Allopatric speciation
________ can also occur in the absence of geologic remodelings, such as when people inhabit a remote location and their offspring evolve.
