The evolutionary phenomenon known as reinforcement is most likely to occur when which of the following already exists?

a. A geographical barrier that separates two populations of the same species
b. Prezygotic isolation between two different species
c. Postzygotic isolation between two different species
d. Gene flow between two separate populations of the same species


Ans: a. A geographical barrier that separates two populations of the same species

Biology & Microbiology

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Members of the ____ flatworm lineage are vertebrate endoparasites;some, called blood flukes, cause an often deadly

disease in humans called schistosomiasis.

a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea

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Alteration of the ________ structure of a protein can transform the protein into an infectious agent known as a prion

A) secondary B) primary C) quaternary D) tertiary

Biology & Microbiology

The most important kind of selection acting on a well-adapted population in a relatively constant environment is:

A) stabilizing. B) directional. C) catastrophic. D) disruptive.

Biology & Microbiology