Chapter 24 - The Origins of Species

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.

species

The word ________ comes from the Latin word meaning "kind" or "appearance."

reproductive isolation

The biological species idea places a premium on ________.