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Pre Test Quiz
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1
Speciation is defined as
A)the evolution of new species by means of reproductive isolation.
B)the existence of single gene pools for individual species.
C)the presence of diagnostic traits that distinguish one species from another.
D)the splitting of one species into two or more species, or the transformation of one species into a new species over time.
2
The __________ species concept provides proof of speciation without abrupt changes in diagnostic traits. According to this concept, if descendants of a group of organisms __________, speciation has occurred.
A)biological; are able to reproduce only among themselves
B)evolutionary; are anatomically identical
C)biological; are anatomically identical
D)evolutionary; are able to reproduce only among themselves
3
An isolating mechanism that prevents reproductive attempts and makes it unlikely that fertilization will be successful is termed a ___________ isolating mechanism. An isolating mechanism that prevents hybrid offspring from developing or breeding is termed a __________ isolating mechanism. Both of these mechanisms function to __________.
A)postzygotic; prezygotic; maintain genetic similarities within species
B)prezygotic; postzygotic; maintain genetic differences between species
C)postzygotic; prezygotic; maintain genetic differences within species
D)prezygotic; postzygotic; maintain genetic similarities within species
4
__________ occurs in populations that become separated by a geographic barrier. __________ occurs without the presence of a geographic barrier.
A)Mechanical isolation; Habitat isolation
B)Habitat isolation; Mechanical isolation
C)Sympatric speciation; Allopatric speciation
D)Allopatric speciation; Sympatric speciation
5
True or False: In evolution, rapid changes prove that the evolutionary process occurs without natural selection in the direction of specific goals.
A)True
B)False





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