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Vocabulary Cross-Word Puzzle

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Across
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When a population has split off into two different groups to the point where they can not interbreed
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Random change in allele frequency
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A change in allele frequency following a dramatic reduction in population
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A state where nothing is evolving or changing
Down
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The selection of a mate based on their best traits
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The comparison of stretches in DNA to mark the passage of evolutionary time
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When two or more species reproduce at different times
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The number of times an allele can occur inside a gene pool
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The change of allele frequencies as a result of the migration of a small subgroup population
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Two populations that can breed develop differences in rituals and other behaviors