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प्रश्न
Differentiate between Vestigial organ and atavistic organ.
अंतर स्पष्ट करें
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उत्तर
| Aspect | Vestigial Organ | Atavistic Organ |
| Definition | Organs that are non-functional in the present organism but were functional in their ancestors. | Sudden reappearance of an ancestral structure that had disappeared or greatly reduced. |
| Functional Status | Non-functional or reduced in function in the current organism. | May reappear with partial or full ancestral function. |
| Occurrence | Present as remnants or reduced organs in the organism. | Appears occasionally or suddenly as a reversion trait. |
| Example | Human vermiform appendix, coccyx, rudimentary wings in kiwi and ostrich, eyes of some burrowing animals. | Rudimentary tail in newborn human babies, additional mammae, large canines, power of moving pinna. |
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