He found that removal of the fin forced fish to expend more energy to swim. University of Victoria biologist Tom Reimchen, reasoning that the adipose fin would not persist “for 60 million years unless it had some use,” decided to investigate. Located between the dorsal and tail fins, the small adipose fin is often clipped by hatcheries to track the salmon they produce. Marine biologists have long thought the “adipose fin” on the back of some fish was vestigial. Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Vestigial Salmon Adipose Fin Actually UsefulĪnother so-called vestigial organ finds a function. Download Free Evolution And Classification Study Guide Answer Key. Vestigial structures are actually the “footprints” of embryology and the “footprints” of the efficiently engineered designs of our common Designer, God. Embryological similarities variation among species vestigial structures homologous. Is it really as worthless as people say, or does it have a purpose after all? Vestigial Organ Arguments: Useful or Unnecessary?ĭo humans really still have 9 Useless Body Parts? From a biblical view accepting God as Creator, we understand vestigial structures are indeed vestiges-“footprints”-but not of a hypothetical, unwitnessed, unproven evolutionary origin. Key Point Wrap-Up Key Point 1: Analogous structures show that unrelated species will evolve similar adaptations in response to similar environmental pressures Key Point 2: Vestigial structures show that a species used to live in a different environment. The appendix has long been maligned as an obsolete vestigial remnant of digestive evolution. Independent Practice (IP) Get an early start on the homework.
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