Paternity test
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A paternity test is used to ascertain who is the father of another person. It is frequently done by DNA analysis of the mother, child, and the possible father. Since a person's DNA is the same in all of their cells, DNA testing can be done with a blood sample, a swab of skin, or a lock of hair. A comparison of one's DNA sequence to someone else's will show if either of them is the parent of the other.