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New alleles arise by


A) nonrandom mating.
B) allele frequency.
C) genetic drift.
D) mutation.

E) B) and C)
F) A) and D)

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The genetic variation in a population is increased by


A) recombination.
B) allele fixation.
C) natural selection.
D) genetic drift.

E) B) and D)
F) B) and C)

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Gene flow between two populations


A) makes the genetic composition of the two populations more similar.
B) eliminates harmful alleles.
C) magnifies the effects of genetic drift.
D) creates genetic differences between the populations.

E) A) and C)
F) B) and C)

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The color of a certain species of beetle is determined by a single gene. Two beetles homozygous for green coloration produce a single offspring with brown coloration. Brown color appeared in this offspring as a result of a ___________.

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