Scientists remain divided over whether the human Y chromosome will eventually vanish. But clinicians say the real concern ...

This video segment from NOVA: "Judgment Day: Intelligent Design on Trial" reveals how genetic evidence helped to confirm an important component of Darwin's theory of evolution by natural selection: ...

For any mammal, the loss of the Y chromosome should mean the loss of males and the demise of the species. So how the Amami spiny rat manages without a Y chromosome has puzzled biologists for decades.