Exam 22: Speciation

Female fireflies identify males by their flashing patterns, which are often so complicated that signals sent by one species cannot be understood by another species. This reproductive isolating mechanism is called ____.

The female reproductive tract of some Drosophila species blocks sperm of another species from reaching her eggs. This is an example of ____.

The apple maggot's natural host plant is the hawthorne; however, over the past 150 years, new populations were found that feed on apples and cherries. This is an example of ____ speciation via the development of ____.

Clinal variation usually results from ____ between ____ populations that are each adapting to slightly different conditions.

If the gene pools of allopatric populations did not differentiate much during geographical separation, then upon reestablishing contact, the populations may interbreed and merge into one. This phenomenon is called ____.

A hybrid zone is defined as an area where two populations may breed and produce ____.

A host race may develop ____.

Postzygotic isolating mechanisms occur when the offspring ____.

Identifying species based on evolutionary relationships is an example of the ____ concept.

Researchers believe the evolution of common bread wheat (Triticum aestivum) resulted from a series of ____ between related species, some of which produced ____ species.

Individuals from different subspecies usually interbreed where their geographic distributions meet.

A smooth pattern of variation along a geographical gradient is referred to as a ____.

Today, evolutionary biologists view speciation as an event.

Define a species cluster and provide examples.

The evolution of a host race is due to the reproductive isolating mechanism called ____ isolation.

Which scientist published the book titled, " Systematics and the Origin of Species " in 1942?

A phylogenetic species comprises ____.

The biological species concept can be used to distinguish all living and extinct species.