Infidelity produces faster sperms
Until now, it has been difficult to prove that fast-swimming sperms have an advantage when it comes to fertilizing an egg.
These sperms swim faster thanks to the greater power of a larger flagellum, but faster sperms also need to have a larger store of energy, which in turn results in larger sperms. Thanks to new analytical methods, the researchers have also managed to demonstrate the order of this development. The sperms first become faster, then larger, following increased female promiscuity in a species.
