The concept of a biological species as a group of organisms capable of interbreeding to produce viable offspring dates back to at least the 18th century, although it is often associated today with Ernst Mayr.
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For instance, infections of nematodes or of arthropods, including Drosophila, species of the rickettsial bacteria Wolbachia can produce a male-specific sterility, which is congenital by means of transmission through the female line.
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