Atavism is the reappearance of those ancestral characteristics in an organism or in the organism of a group,which do not occur normally or which represent the reminiscent of normal structures possessed by the individuals of other groups.Such abnormal structures are known as atavistic characters of reversions or atavisms.
In such cases abnormal characters or structures appear in the embryo or in the adult,which were not present either in the parent or grandparents but in some remote ancestors.
Tail is absent in man,but occassionally a human body is born with a short fleshy tail.It is devoid of vertebrae and is removed by surgeon with no trouble.
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