Answer by Diane Eager. The idea behind evolution is that the structures provide evidence that a long, long, long time ago, all animals were the same, then they got separated, and changed into different species. Answer and Explanation: Homologous structures provide evidence for evolution as their intrinsic commonalities suggest a common ancestor in the lineages of … Evolution is the study of how different types of living organisms adapt and change over time. (This is one of numerous examples of "homologous" structures exhibited by related species. The Original question was: School textbooks and lesson plans use homologous structures, such as the bones in vertebrate limbs, as evidence for evolution. Similar characteristics due to relatedness are known as homologies. Homologous structures have enough in common to suggest that they have a common ancestor. Share . Evolution is a phenomenon that can be directly observed, so there’s no dispute that evolution happens. That’s not quite how it is, let me explain, shortly. New species continually emerge while others go extinct in response to fluctuating environmental conditions. Homologous organs are organs which are similar in the underlying anatomy but perform different functions. Credit: Tony Hisgett/Flickr/CC-BY-2.0 Homologous structures, such as the fins of whales and the hands of monkeys, demonstrate that while a species may use structures for different purposes, the species shared a common ancestor. How do homologous structures provide evidence for evolution? How Do Homologous Structures Support Evolution? Evolutionary theory predicts that related organisms will share similarities that are derived from common ancestors. However, the structures have changed in form and/or function to suit the organism's need. They proved evidence of evolution in that something can be traced back by that common strand. Like a human arm and a bat’s wing. Lines of evidence: The science of evolution: Homologies. The author concludes the answer is evolution. Email . These homologous organs point towards a common ancestor from which these organisms evolved. Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation. How can we refute these claims? While homologous structures show how similar species have changed from their ancient ancestors, analogous structures show how different species have evolved to become more similar. No idea what Zeal is talking about. Homologous structures provide evidence for evolution because it can tell when the organisms will evolve from a common ancestor during evolution. thts a loooong answer made short. If you're seeing this message, it means we're having trouble loading external resources on our website. Homologous organs are those organs which have same anatomical structure but perform different structure. How Does Embryology Provide Evidence for Evolution? Print . The presence of a homologous structure suggests common ancestry, and further suggests that the nearest common ancestor of two organisms had the trait which is homologous. Updated May 28, 2019. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Then, the organisms without the altered gene die out, and eventually only the animals with the altered gene are left. yea. Not until the latter half of the 20th century, when it became possible to analyze and compare DNA, could researchers reaffirm the evolutionary relatedness of species with homologous structures. While the evidence of homologous structures has long been known, it has just recently been widely accepted as evidence of evolution. Homologous structures are derived from a same common ancestor. Homologous structures are organs and body parts that have the same internal organisation. By Dr. Mary Dowd .

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