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1
The forelimbs of mammals are an example of
A)vestigial organs.
B)analogous structures.
C)homologous structures.
D)All of the above
2
Which type of selection acts to eliminate both extremes of phenotypes?
A)Stabilizing
B)Disruptive
C)Directional
D)Migration
3
______________ is the result of changes that occur within a population.
A)Macroevolution
B)Microevolution
C)Speciation
D)Selection
4
Which of the following plays a role in speciation?
A)Lack of phenotypic variants in a population
B)Natural selection reinforcing differences between two races
C)Geographic isolation of organisms that were once in the same population
D)The ability of organisms to interbreed with other members of the population
E)Both 2 and 3
5
_________________ is the random loss of alleles in a population due to chance occurrences and not due to fitness.
A)Mutations
B)Migrations
C)Genetic drift
D)Non-random mating





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