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Vocabulary Cross-Word Puzzle

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