The fact that nearly everyone on the island of Sardinia has the same X chromosome sequence indicates that the population has experienced

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The fact that nearly everyone on the island of Sardinia has the same X chromosome sequence indicates that there has been nonrandom mating. This means that individuals with similar X chromosome sequences were more likely to mate with one another, leading to the spread of this particular sequence throughout the population. This is a form of genetic drift rather than natural selection or gene therapy. While mutation could play a role in generating new X chromosome sequences, it would not explain why such a high proportion of the population has the same sequence. Consanguinity (inbreeding) could also be a factor, but it is not specifically mentioned in the question stem.

The Fact That Nearly Everyone on the Island of Sardinia