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 suggests nonrandom mating. This could be due to consanguinity (inbreeding) or cultural practices that promote mating within a limited gene pool. This does not necessarily indicate mutation or natural selection.

The Fact That Nearly Everyone on the Island of Sardinia