And since each parent contributes 50 percent to a child's DNA, two siblings may have different test results. The results, after all, might not be what patients want to hear - especially because they could reveal an inherited mutation that puts themselves or their kids at risk. MORE FROM MICHIGAN: Sign up for our weekly newsletterīut put into practice, genetic testing is more nuanced. On the surface, the concept seems like a no-brainer: A sample of blood or saliva can offer clues to your body's genetic defects, a road map to predicting future problems ranging from Alzheimer's disease to cancer.
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