THE SELFISH GENE or ancient jumping gene transposons (TE) from other species was likely carried by viruses or parasites. “The staggering evolutionary success of TEs is attributed mostly to their ability to out-replicate the host genomes in which they reside, as opposed to any selective advantage that they might provide to their hosts. Indeed, TEs can spread within and among genomes, even when there is a selective cost to their hosts”. ”
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