Question

What must happen before meiosis can begin?

Answer 1

The DNA replication is completed before meiosis. The genomes become double.

Explanation:

The DNA replication is completed before meiosis. The genomes become double. 
The double genomes will distribute in a haploid genome into the four cells.

Answer 2

Crossing over-it is the phenomenon of iner mixing of genetic materials between the non sister chromatids of the paternal and maternal chromosomes (homologous chromosomes) .

Practically, meiosis is preceded by an interphase espicially S phase during which DNA is synthesized

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