Get Vestigial Structures Definition Biology Example Images. A vestigial structure or vestigial organ is an anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism of the given species. Vestigial refers to an organ or part (for example, the human appendix) which is greatly reduced from the original ancestral form and is no longer functional or is of reduced or.
Vestigial structures are inherited from ancestors but have lost much or all of their original for example, the hipbones of the bottlenose dolphin, shown on page 467, are vestigial structures.
Vestigial structures are considered evidence, but no more critical than any other line of evidence in biology and palaeontology. Vestigial structures are often homologous to structures that are functioning normally in other for example, the formation of goose bumps in humans under stress is a vestigial reflex; For example, lamarck stated that a giraffe neck gets longer because it stenches it neck to reach taller leaves on a tree and then that acquired characteristic is then passed to. Vestigial structures in fruit flies.
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