A fascinating mosaic has recently been discovered in the Mediterranean, and we're not talking about the famous tiled art. Here, we're talking about a genetic mosaic in the Mediterranean mussel (Mytilus galloprovincialis), which stretches for over 600 km along the North African coast. What led to this incredibly large hybrid zone? Dr Nicolas Bierne from the University of Montpellier explains all in this episode of the Heredity Podcast.

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