It seems difficult to explain how a gene could remain at a moderately high frequency in the population if most men with the gene do not reproduce. How would the hypothesis about epigenetics help with the explanation?

Ciccarelli: Psychology_5 (5th Edition)
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It seems difficult to explain how a gene could remain at a moderately high frequency in the population if most men with the gene do not reproduce. How would the hypothesis about epigenetics help with the explanation?

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Bio-psychologists define genes as biochemical collectivities accumulated through inheritance adapting DNA compositions and chromosomal fragments. They mention that genes are vital and competent in protein synthesis, and DNA endures the genetic data approaching up the chromosomes. In psychological examinations, epigenetic effects confer the impact of environmental changes and genetic experiences of persons. The experience encountered by them on daily basis significantly affects their way of gene expression. 

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