Modern geneticists no longer use these familiar symbols and instead rely on a square (for male) and circle (for female): This symbolism was developed by Pliny Earle, a doctor with the Bloomingdale ...

We erroneously used a male symbol instead of a female symbol. — Washington Post Express (@WaPoExpress) January 5, 2017. This is how the cover should have looked. We apologize for the mistake.

We erroneously used a male symbol instead of a female symbol. — Express (@WaPoExpress) January 5, 2017. And quickly after that, an image of how the cover should have appeared: ...