Chromosomal shuffling in parental eggs or sperm can create new characteristics in the next generation. In fruit flies, it seems that mothers with a parasitic infection produce more such recombinant offspring than uninfected mothers.
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Agrawal, A. Infection elevates diversity. Nature 525, 464–465 (2015). https://doi.org/10.1038/525464a
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DOI: https://doi.org/10.1038/525464a
