PLZ HELP 4. What occurs when there is a change in the allele frequency in the gene pool across generations, not due to migration?
1.mutation
2. gene pool diversity
3. Hardy-Weinberg equilibrium
4. genetic drift

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the cell cycle is the final answer! : )

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.