厘摩centimorgan,简写为cM),或称为图距单位map unit),是遗传连锁中的距离单位。“厘”(centi-)指百分之一,个位是“摩尔根”(M,纪念现代遗传学之父托马斯·亨特·摩尔根),但一般只使用厘摩。1厘摩的定义为两个位点间平均100次减数分裂发生1次遗传重组。连锁位点之间的距离不超过50厘摩,两个位点间距50厘摩即意味着两者完全不连锁。对于人类来说,1厘摩平均相当于100万个碱基对[1][2]

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