Hailed the 'calico hair' trend, the new colour in town is inspired ... I have brown hair now I want tortoise shell cat hair," one penned, while another added: "I love it but I think I’d like ...

A prime example of X inactivation is in the coat-color patterning of tortoiseshell or calico cats (Figure 1). In cats, the fur pigmentation gene is X-linked, and depending on which copy of the X ...