Evidence for Evolution

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by VanessaWilde
Last updated 6 years ago

Evolutionary Biology

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Evidence for Evolution

Evidence for Evolution

A fossil record helps support the idea of evolution because it shows how time has gone on and changes have been made throughout the years.

Homologous- Similar in orgin, different in function, recent common ancestor, may appear in embryonic development and disappear before birthAnalogous- Different in orgin, similar in function, lacks recent common ancestorVestigial- Structures that serve no use to animals(All show how different species may not be exact, but are closely related with many similarities.)




"Certain blood proteins found in almost all organisms give additional evidence that these organisms descended form a common ancestor. Such biochemical compounds, including cytochrome c and blood proteins, are so complex it is unlikely that almost identical compounds would have evolved independently in widely different organisms. Further studies of cytochrome c in different species reveal variations in the amino acid sequence of this molecule. For example, the cytochrome c of monkeys and cows is more similar than the cytochrome c of monkeys and fish. Such similarities and differences suggest that monkeys and cows ate more closely related than are monkeys and fish. Scientists have similarly compared the biochemistry of universal blood proteins. Their studies reveal evidence of degrees of relatedness between different species. This evidence implies that some species share a more recent common ancestor than other species do. From such evidence scientists have inferred the evolutionary relationships between different species of organisms."

Anatomical- "All living organisms start their existence as a single cell. They also develop and reproduce by similar cell division processes. All living things have a limited life span at the end of which they die.All of these major chemical and anatomical similarities between living things can be explained by assuming that they all originated from the same ancestor and/or came into existence as a result of similar natural processes."

Chemical- "The formation of living forms from non-organic matter is called abiogenesis. Apparently, sediments like clay played an important role in the formation of the first protein and RNA molecules. Due to its structure, clay attracts small organic molecules that combine, forming more complex organic polymers. It also contains metal catalysts like zinc and iron. Clay also collects energy from radioactive decay and releases it when the temperature or humidity changes. These first proteins formed coacervates. Coacervates consist of macromolecules surrounded by a film of water molecules. Coacervates selectively absorbed different materials from surrounding water and incorporated them into their structure. Millions of years later, coacervates evolved into true biological cells."

Chemical and Anatomical Similarities


As species colonized new habitats, there old ranges were divided by mountain ranges or other barriers, they took on the distributions they have today. Alfred Russel Wallace sought to demonstrate that evolution did indeed take place, Wallace came to much the same conclusion that Darwin published in the Origin of Species: biogeography was simply a record of inheritance. As species colonized new habitats and their old ranges were divided by mountain ranges or other barriers, they took on the distributions they have today.

Geographic Distribution

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"Darwin coined the term natural selection to describe the process by which organisms with favorable variations survive and reproduce at a higher rate. An inherited variation that increases an organism's chance of survival in a particular environment is called an adaptation. Over many generations, an adaptation could spread throughout the entire species. In this way, according to Darwin, evolution by natural selection would occur."

"Artificial breeding is the process by which humans breed other animals and plants for particular traits. Typically, strains that are selectively bred are domesticated, and the breeding is normally done by a professional breeder."


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