ScienceAlert on Instagram: “ Calico cats are actually super interesting from a genetic point of view. Girl cats have two X chromosomes, and one will inactivate a few days after conception. It inactivates randomly, leaving blotches of fur coded with one X chromosome, and the remaining fur coded with the other! “
What about Kaneki being associated with the sterile male calico cat? Eto might be sterile too considering the length she is going to create half-ghouls. Maybe the Washuu provide genetic material because half-ghouls are sterile and cannot mate with each other?