Could Epigenetic Inheritance Play a Role in Evolution?

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In summary, Lamarck's theory of inheritance of acquired characteristics was replaced by Darwinism, which is a more modern and effective theory. There is evidence that shows Lamarckism does not work, and that epigenetics plays a much larger role in evolution.
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Is this idea refuted at all?

Also, is there a possibility that Darwinism and this theory could both work in conjuction? Perhaps a hybrid of the two.

Any information you're willing to contribute to my curiostiy would be greatly appreciated.
 
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More information on Lamarck here: http://www.ucmp.berkeley.edu/history/lamarck.html

I think that epigenetics follows his line of thought: the behaviour of an animal can change the genetic code through epigenetics, changing the heridity of traits. There are some experiments that suggests the heridity of behaviour, for instance licking a litter in rats. I am not convinced whether this is just learned inheritance or real epigenetic inheritance.
 
  • #3
Lamarckism (inheritance of acquired characteristics) is a long outdated theory that was replaced by Darwinism. The entire field of genetics refutes it.
 
  • #4
Monique said:
I think that epigenetics follows his line of thought:
Perhaps very loosely, but Lamarck's theory of inheritance of acquired characteristics didn't distinguish such subtleties as epigenetics does. So, although there may be some similarity in terms of inheritence that is not dependent on DNA structure alone, Lamarckism, per se, simply didn't account for genetic inheritance at all.

For anyone interested in an overview on epigenetics with links to an issue of Science with more detailed articles, follow this link: http://www.sciencemag.org/feature/plus/sfg/resources/res_epigenetics.shtml
 
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  • #5
Moonbear said:
The entire field of genetics refutes it.

Yep, Lamarkianism pre-dated genetics. There was an ugly, yet effective experiment used to disprove Lamarkianism in which the researcher cut the tails off many generations of mice and showed that there was no inherited reduction in tail length. (I forget who/when...I read it in Carl Zimmer's book "Evolution, The Triumph of an Idea", which I don't have with me at the moment.)

Also note in Monique's link that Lamark postulated spontaneous generation of the most primitive life forms with subsequent evolution toward higher forms (with of course a bias toward Humans).
 
  • #6
"Jews and other religious groups have been circumcising men for hundreds of generations with no noticeable withering of the foreskin among their descendants. However, Lamarck did not count injury or mutilation as a true acquired characteristic, only those which were initiated by the animal's own needs were deemed to be passed on."

"Environmental factors are also known to influence the emergence and reversion of epigenetic factors. This produces the possibility that epigenetic variations might be produced at several loci and in several cells or organisms. If these systems would affect biological evolution, adaptive variation would occur, which is a Lamarckian form of evolution. The question then is, to what extent does epigenetic inheritance play a direct role in evolution?"

References
http://en.wikipedia.org/wiki/Jean-Baptiste_Lamarck
http://en.wikipedia.org/wiki/Epigenetic_inheritance
 

1. What is the difference between Darwinism and Lamarckism?

Darwinism, also known as the theory of natural selection, is the idea that species evolve through random, gradual changes in their genetic makeup over time. It is based on the concept of survival of the fittest, where individuals with advantageous traits are more likely to survive and pass on their genes to the next generation. On the other hand, Lamarckism proposes that species evolve through the inheritance of acquired characteristics, where traits acquired during an organism's lifetime can be passed on to its offspring.

2. Which theory, Darwinism or Lamarckism, is more widely accepted in the scientific community?

Darwinism is the more widely accepted theory in the scientific community. This is because it is supported by a wealth of evidence from various fields such as genetics, paleontology, and biogeography. Additionally, the concept of natural selection has been observed and tested in numerous studies, providing strong support for the theory.

3. Can Lamarckism be completely ruled out as a valid theory?

While Lamarckism has been largely rejected by the scientific community, some researchers argue that it may still have some validity in certain contexts. For example, some studies have shown that traits acquired during an organism's lifetime may influence gene expression and be passed on to the next generation. However, these cases are limited and do not fully support the overall idea of Lamarckism.

4. Are there any modern-day applications of Darwinism and Lamarckism?

Darwinism continues to be applied in various fields such as medicine, agriculture, and conservation. By understanding how natural selection works, we can better predict and combat the spread of diseases, improve crop yields, and protect endangered species. While Lamarckism may not be as widely used, some researchers have suggested that it could have potential applications in fields such as epigenetics and personalized medicine.

5. Can Darwinism and Lamarckism be combined to form a more comprehensive theory?

Some scientists have proposed integrating aspects of both Darwinism and Lamarckism in a theory known as the Modern Synthesis. This theory acknowledges that natural selection is the main driving force of evolution, but also recognizes the role of other mechanisms such as genetic drift and gene flow. It also takes into account the idea that certain traits acquired during an organism's lifetime may have an impact on its evolution. However, the Modern Synthesis is still a highly debated topic and is not widely accepted in the scientific community.

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