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Question
Appearance of ancestral characters in new borns such as tails, multiple mammae, etc., are ______.
Options
atavistic
vestigial
analogous
homologous
MCQ
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Solution
Appearance of ancestral characters in new borns such as tails, multiple mammae, etc., are atavistic.
Explanation:
Atavism refers to the reappearance of ancestral traits that had disappeared or been significantly reduced in previous generations, but that suddenly reappear in some individuals. These atavistic structures, like a rudimentary tail in human babies or extra nipples (mammae), are evidence of evolutionary history and common ancestry. They are distinct from vestigial structures, which are reduced or non-functional remnants of organs found in ancestors.
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