Study: A woman`s eggs choose lucky sperm during last moments of conception
By: Team Ifairer | Posted: 10-06-2020
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"What we didn't know until this study is those chemical breadcrumbs act differently on sperm from different males, in effect choosing which sperm is successful," Fitzpatrick added. "What this is suggesting is that these fluids are giving females one extra chance - long after she's picked her partner - to bias the number of sperm that are going to be coming towards the eggs."
And here's the extraordinary finding: A woman's egg doesn't always agree with her choice of partner. "We expected to see some sort of partner effect, but in half of the cases the eggs were attracting more sperm from a random male," Fitzpatrick said. "The most likely explanation for this is that these chemical signals allow females to choose males who are more genetically compatible."
Source: edition.cnn.com