Slate takes a break from endless political analysis to tackle a biological question: Can humans have sex with other animals and produce offspring? The answer: "Probably not." Um, "probably"? Oh dear.

When two organisms typically do not interbreed with one another, they are considered different species. But what are the reproductive barriers that isolate one population from another? Hear the ...

A rare example of gene incompatibility between two species of budding yeast has been found. This discovery of elusive 'speciation' genes adds to other reproductive-isolation mechanisms operating in ...

Hybrid sterility and reproductive isolation represent critical challenges for rice breeding programmes, as these biological barriers restrict the successful fusion of diverse genetic backgrounds. By ...