High Quality Content by WIKIPEDIA articles! Cats, like all living organisms, occasionally have mutations that affect their body type. Sometimes, these cat body type genetic mutations are striking enough that humans select for and perpetuate them. This is not always in the best interests of the cat, as many of these mutations are harmful; some are lethal in their homozygous form.This page gives a selection of cat body type mutant alleles and the associated mutations with a brief description.Jb = Japanese bobtail gene (dominant with incomplete penetrance). Cats heterozygous for this gene have abnormal tails, but unlike the Manx cat there are no associated skeletal disorders and the gene is not associated with lethality.M = Manx gene (dominant). Cats with the homozygous genotype (MM) die before birth, and stillborn kittens show gross abnormalities of the central nervous system. Cats with the heterozygous genotype (Mm) show severely shortened tail length, ranging from taillessness to a partial, stumpy tail. Some Manx cats die before 12 months old and exhibit skeletal and organ defects.

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