Between homologous, analogous structures, and vestigial structures, which suppor the theory of evolution? Explain why. Mila W. Apr 25, All of them. Explanation: Homologous structures, or structures that are made of similar things but have very different functions Example: A human hand and a whale flipper do very different things, but have the same number and basic arrangement of bones prove that since the structures are slightly similar in appearance, any two species sharing homologous structures must have had a common ancestor, however distant.
In other words, evolution has to exist for two different, unrelated animals to have different solutions to a common problem Needing to fly to better catch prey Vestigial structures, or structures that have no function anymore Like the human tailbone or appendix. For a species to have changed, evolution must have happened.
Related questions How do I determine the molecular shape of a molecule? For instance, in the human body, an example of an anatomical part is the skeletal muscle or inner ear. A specific example of a complex body part is the bony labyrinth or osseous labyrinth.
Homologous structures are those that are similar in multiple species and show that the organisms descended from a common ancestor. However, having the same ancestry does not mean that a bodily structure will always have the same function. Homologous structures can be anything from a specific skeletal structure to the nervous system to a body plan.
An example of a homologous structure is the forelimb in mammals. Dogs, whales, bats, humans, cats and other mammals have similar forelimb patterns. Although they look different on the outside, they are anatomically the same on the inside. Another example of homologous structures is visible in vertebrate embryo development. Vertebrates have a gill slit and tail at similar developmental stages. However, these structures can change as the organism grows. You can also see similar neural tube and notochord development in many different types of embryos.
The foot of a mollusk is a homologous structure because it is common among gastropods, cephalopods and bivalves. Most mammals have similar vertebrate spine structures with giraffes, people and dogs all having the same number of vertebrae. Analogous structures are those that are the same among different species that are not related.
These organisms do not have a common ancestor, but their anatomical structures serve the same or similar purpose. A different ancestry can still lead to body parts with the same function.
An example of analogous structures are the wings of butterflies and bats. Thus, this is the main difference between homologous structures and vestigial structures. Moreover, homologous structures are the similar anatomical structures found in the evolutionary-related animals while vestigial structures are the anatomical structures that have reduced their size as they are no longer been used.
Hence, this is another difference between homologous structures and vestigial structures. Also, one other difference between homologous structures and vestigial structures is that the homologous structures perform a similar function while vestigial structures have no important function.
Some homologous structures are the limb of mammals, organs of the body, bones, etc. Homologous structures are the similar anatomical structures of evolutionary-related animals.
Most often, these structures perform a similar function. Significantly, homologous structures are derived from a common ancestor. In comparison, vestigial structures are the anatomical structures that have reduced their size as they are no longer used by the animal. This type of structures also has a common ancestry. But, they have no important function in the animal. Therefore, the main difference between homologous structures and vestigial structures is their functional relationships.
Scoville, Heather. WikiJournal of Medicine 1 2.
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