How does this work? epigenetic trait="stably heritable phenotype resulting from changes in a chromosome without alterations in DNA sequence"
ie what does it mean for a chromosome to change without a change in the dna sequence? I thought they were roughly the same thing...
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proteins and whatnot passed in the cell plasm can activate or deactivate genes.
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the proteins (e.g. histones in chromatin) are copied along with the DNA, so their state is heritable
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a chromosome is not bare DNA. These would be variations in what's bound to the DNA that may influence the expression of the genes.
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tl;dr, they're like on-off switches. many have a static default position. some however do not, so Lamark wasn't totally wrong either
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genomic imprinting is the best understood example. One example, the gene H19.
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