Question

Appearance of ancestral characters in new borns such as tails, multiple mammae, etc., are ______.

विकल्प

• atavistic

• vestigial

• analogous

• homologous

Answer 1

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.