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Scientists have a long-standing mystery about the feline world. Geneticists from Kyushu University in Japan have why eight out of ten ginger cats are male. Dr Hiroyuki Sasaki that a mutation in the X chromosome responsible for a previously unknown "orange gene". Dr Sasaki said: "Identifying the gene has a longtime dream, so it's a joy to have finally it." The gene is responsible for pigmentation in the skin of animals. Male mammals have an X and Y chromosome. If the male cat's X chromosome the gene, it will be a ginger. Because a female cat has two X chromosomes, the gene to be present in both for the cat to orange. This is less likely to .

Dr Sasaki and his colleagues' research has been in the journal "Current Biology". In the study, researchers the DNA of 18 cats. Ten of the cats had ginger fur. The researchers that all of the ginger cats had a gene mutation called ARHGAP36. The non-ginger cats did not this. Dr Sasaki said cat lovers fur colour with personality traits. He wrote: "Many cat owners by the idea that different coat colours and patterns are with different personalities. There's no scientific evidence for this yet, but it's an intriguing idea, and one I'd to further." He said ginger cats may particular behavioural characteristics because most of them are male.