Not every modern human has the same set of Neanderthal DNA, however; different people will, by chance, have inherited different fragments. But there are also some areas, termed "Neanderthal deserts," where none of the Neanderthal DNA seems to have persisted. Notably, the largest Neanderthal desert is the entire X chromosome, raising questions about whether this reflects the evolutionary fitness of genes there or mating preferences.
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“我母亲是西安人，早在30年前就办理了退休手续，眼下几乎每天都拿着手机看新闻，刷短视频，尤其是一些投资理财、中医和养生秘诀，特别感兴趣。”龙先生告诉记者，自己也曾劝过母亲，但她就是不听。