他们根据两个基因组中的基因差异，计算远古时期的种群数量。
They used the number of those genetic differences between the two genomes to calculate how large the population was at that time.
总体上，两个物种的基因组是相似的，除了有低于1％的DNA差异；
Over all, the genomes of the two species are very similar and differ in less than 1 percent of their DNA.
尽管，Reich博士和他的研究小组并不认为这种基因差异处于正常水平，但他们还是通过DNA全序列分析，揭示出了这对基因组的进化历史。
Instead of looking at average genetic differences, though, Dr Reich and his colleagues used the complete sequences to reveal the evolutionary history of the genomes.
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