Analysis of the genome sequence of an organism shows that an area of the genome contains stretch of several thousand base pairs that differ significantly in % G + C content from the rest of the genome.Most likely this DNA was originally obtained from a gene duplication event.

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The significant difference in % G + C content suggests that this DNA was likely obtained through horizontal gene transfer from a different organism, not from a gene duplication event within the same organism. Gene duplication typically results in sequences with similar % G + C content to the rest of the genome.

Analysis of the Genome Sequence of an Organism Shows That