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Long live the Y?

Researchers have identified a means by which the Y chromosome may forestall, or at least delay, the gradual degradation that some biologists argue will ultimately delete it from the human genome.

Bacterial diet quiets worm genes

Genetically engineered bacteria help biologists turn off worm genes.

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You report that “the sea squirt has the beginnings of a spinal cord, making it a so-called chordate.” That’s the same mistake I fight against each time I teach my zoology class. What makes a sea squirt a chordate is the notochord in the animal’s larval stage. A notochord is a skeletal component, not a […]

Sea squirt’s DNA makes a splash

The DNA sequence of a sea squirt may reveal the origins of vertebrates.