History of genetics refers to Lamarckism for acquired characteristics inheritance which published in about 1809, and later to Darwin's theory of acquired traits inheritance ( Pangenesis ) in 1869, Darwin's pangenesis theory was thought that parents could pass on traits acquired in their lifetime. The basic concept of inheritance of acquired characters was finally widely rejected in the early 20th century.
Now, Epigenetic study the transfer of non-genetic information (Environmental effects ) across generations through its effect on gene expression by methylation and acetylation of genetic material (Methyl and acetyl are epigenetic tags- chemicals that act as “switches “ that determine gene expression without changing the underlying genetic code).
i think epigenetic just expand the theroy, the two theroies are more about traits,while epigenetics helps to connect traits&environments with genetics.
if any traits have effects on epigentic reprogramming (rebuilding of DNA methylation, histone modification, histone turnovers, etc.) of germline cells, the changes may be passed to next generation and may emerge in next generation or the next.
an extreme example is operating embryos through oocytes or even eggs directly
Dear, Hassan
the genetic material (DNA and RNA) are the support of heredity thus all epigenetic Action transmitted (such as methylation) generation to generation are an origine for a portion of DNA or RNA.
Dear Semir
Epigenetics ( heritable change in gene expression ) appear as a result to change in environmental factors which lead to change in chromatin structure with out change in DNA sequence.
There are many published studies about epigenetics, one of these experiments described in : https://www.sciencedaily.com/releases/2009/04/090412081315.htm
" A certain laboratory strain of the fruit fly Drosophila melanogaster has white eyes. If the surrounding temperature of the embryos, which are normally nurtured at 25 degrees Celsius, is briefly raised to 37 degrees Celsius, the flies later hatch with red eyes. If these flies are again crossed, the following generations are partly red-eyed – without further temperature treatment – even though only white-eyed flies are expected according to the rules of genetics."
Good Luck
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