Appearance of ancestral characters in the newborns, such as tail, cervical fistula in man, gill slits etc., are known as _____.

Homologous

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Analogous

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Vestigial

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Atavism

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Solution

The correct option is D Atavism
The appearance of ancestral characters in the newborns, such as a tail, cervical fistula in man, gill slits etc. are known as Atavism. Atavism is a phenomenon of modification of a biological structure in which an ancestral character reappears after being lost in previous generations due to evolutionary change. In this, a particular trait looks similar to remote ancestor rather than its own parents.
Thus, the correct answer is 'Atavism'.

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