Question 19 • 26-27 Biology A
Each cell contains many copies of mitochondrial DNA, so a smaller sample can often provide enough DNA for testing, making A correct. Its many copies also make mtDNA more likely to be recoverable when nuclear DNA is degraded, so B is correct. mtDNA is generally passed from a mother to her children, allowing investigators to compare it with maternal relatives; it is not inherited from the father, so C is incorrect and D is correct.
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