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It doesn't quite work due to genetic imprinting.[0] basically some chromosomes are labelled "from mum" and some "from dad" and specific portions from each are active. It's all rather complex but where imprinting doesn't work right you do get distinct genetic conditions (compare Prader Willi and Angleman syndromes).

[0] https://www.genome.gov/genetics-glossary/Genetic-Imprinting

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That's fascinating, is such imprinting something that we have the technology to control yet - or in the near future?

I'm not expert but as far as I know no where near having the ability to control it.

Ah that's unfortunate, thanks for the info. Very interesting to think about the possibilities of the far future anyway.

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