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INTRODUCTIONSuccessful sexual reproduction requires coordinated interactions between animals1, gametes, and, in internal fertilizers, between the ejaculate and the female reproductive tract (FRT).2–4 Studies of these phenomena have revealed how male and female players work together, including the requirement for binding between molecules on spermatozoa and egg surfaces for fertilization, (reviewed by Springate and Frasier5) or the requirement for genomes with complementary female and male imprinting to allow a mammalian zygote to develop properly.6,7 Despite recognition of these many cooperative interactions, there has been the perception that interactions between spermatozoa and the FRT tend to be hostile in the sense that the FRT provides a selective environment for high quality spermatozoa. The concept of a hostile FRT has also resonated with evolutionary biologists, as a selective environment in which competition between ejaculates of different males provides a means for females to select the “best” spermatozoa (i.e., “sperm selection” or “cryptic female choice”).8,9 A hostile FRT, however, is hard to reconcile with the fact that spermatozoa are often stored and maintained within the FRT, extending the postmating period in which eggs can be fertilized.Here, we review examples that led to the idea that the FRT is hostile to spermatozoa, and then
Andrology – Wiley
Published: Jul 1, 2023
Keywords: cervix; female reproductive tract; fertility; spermatozoa; uterus
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