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Biological details of the imprinted brain theory

MonDie
in Evolution, Morphology and Exobiology

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I've read much psychological discussion on Dr Badcocks blog on PsychologyToday. However, given that Badcock and Crespi's imprinted brain theory recently recieved some strong support (below), I would like to know more about the theory's biological underpinnings.

Opposite risk patterns for autism and schizophrenia are associated with normal variation in birth size: phenotypic support for hypothesized diametric gene-dosage effects.

 

What are imprinted genes? How could they make such general inferences about paternal-maternal baises in gene expression or silencing?

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