Reassortment refers to the mixing of genetic material, resulting in the formation of new genetic combinations. This occurs during the meiosis, particularly during chromosomal crossover and assortment of chromosomes. The random chromosomal segregation and assortment during meiosis contributes to the production of gametes that are genetically unique. This step particularly occurs at anaphase I. Reassortment is also observed between two similar viruses in which they mix their genetic materials inside their common host cell. Thus, the result is new genetic combinations for both viruses. This is observed in influenza viruses. Two strains of influenza virus mix their RNA segments and assemble into new viral particles. It seems that this is, in principle, analogous to sexual reproduction.
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