All the Genomes

One problem with personal genomics, writes John Rennie at Smart Plant's Savvy Scientist, is that people don't have just one genome. Rather, Rennie says, people can be mosaics with various inactivated chromosomes; mothers may be chimeras, containing their fetus' DNA; and neurons, for example, appear to have rearrangements that other tissues do not. Never mind the microbiome, he adds.

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