sciencehabit writes "A rare Japanese flower named Paris japonica sports an astonishing 149 billion base pairs, making it 50 times the size of a human genome — and the largest genome ever found. The genome would be taller than Big Ben if stretched out end to end. The researchers warn however that big genomes tend to be a liability: plants with lots of DNA have more trouble tolerating pollution and extreme climatic extinctions—and they grow more slowly than plants with less DNA, because it takes so long to replicate their genome."
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