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In the video 'Journey of Man', geneticist Spencer Wells uses markers (mutations) in the blood to (a) trace the journey of 2 groups of modern

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In the video 'Journey of Man', geneticist Spencer Wells uses markers (mutations) in the blood to (a) trace the journey of 2 groups of modern humans who left Africa about 50,000 years ago O b) explain how mutations occur O c) show that these mutations occur in the X (female) chromosome O d) show that some mutations are beneficial

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