Meiosis is a complicated process whereby specialized cells undergo replication, recombination, and two successive divisions to create (typically) 4 haploid gametes (eggs or sperm). While it seems that the evolutionary purpose of meiosis is massive variation within a population, its evolutionary origins are somewhat of a quandary. There are no existing intermediate processes of meiosis, it is not clear if there even were reducible steps. But it is fairly certain that it developed early in eukaryote lineages.
Here is a pretty good article with a theory regarding meiotic development: http://www.genetics.org/content/181/1/3.full .
Basically, I would like to know what are some of your theories regarding how meiosis evolved.