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Evolution — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEvolution2 Marks
Question
What is called Atavism or reversion? Give any two examples of this.
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Answer

Atavism or reversion is the sudden reappearance of some ancestral features which was either vestigial or altogether absent in parents. These structures prove that those who possess these structures have evolved from ancestors in whom these structures would have been fully developed.
Example : (i) presence of thick body hairs, (ii) short temporary tail, (iii) ability to move Pinniae etc.

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