Chris Roy, a Milwaukee software engineer and animal-rescue advocate, founded Ginger Cat Appreciation Day in 2014 after the death of his orange cat Doobert, whom he had cared for since finding him as a stray kitten 17 years earlier. The cat also gave his name to Doobert.com, the animal-rescue transport platform Roy launched the same year.
The puzzle hiding in plain sight
Ginger cats are everywhere in culture, but their color was a genuine scientific mystery. Geneticists worked out generations ago that orange was sex-linked, riding on the X chromosome. A male cat has one X, so a single copy of the orange variant turns him fully ginger.
A female cat has two X chromosomes and needs the variant on both. That is hard to inherit, which is why only about 4 percent of female cats are orange. The same chromosome rule explains calicos and tortoiseshells, which are almost always female.



