Mechanisms for inheriting phenotype outside of the genomic DNA sequence.

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Function and Mechanism of Height Genes

I have an inquiry regarding the exact function of height genes. To my knowledge, although they are heavily regulated by epigenetic factors, height genes can have either an "on" or an "off" allele, ...
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What is the gene regulation behind human adaptation to higher altitudes and therefore higher hemoglobin levels?

Some people in the Amazonian forest and in Himalayan mountains have reported living perfectly with extremely high levels of hemoglobin. I was wondering what type of gene regulation goes on in order ...