The remarkable diversity in sperm morphology and performance in zebra finches is generated by a supergene on a sex chromosome and maintained by a heterozygous advantage.
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Fisher, H.S. Supergene yields super sperm. Nat Ecol Evol 1, 1064–1065 (2017). https://doi.org/10.1038/s41559-017-0261-0
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DOI: https://doi.org/10.1038/s41559-017-0261-0