About one-quarter of the hundreds of genes on the inactivated X chromosome in XX cells manage to escape that silencing, at least some of the time.

When X-linked genes evade silencing on the “inactive” chromosome in XX cells, some protect women from diseases such as cancer, but others seem to promote conditions such as autoimmunity.

A genomic analysis from 23andMe suggests that people inherit two copies of a chromosome from only one parent nearly twice as often as researchers had realized.

A quirk of nomenclature originates in the study of insect cells.

The Stanford University professor was known for his work on sex determination and courtship in flies.

A toothpick and a bit of chance shaped David Page’s career, which he has dedicated to understanding the mammalian Y chromosome and fetal germ cell development.