An example of a polygenic trait is human skin color variation. Several genes factor into determining a person's natural skin color, so modifying only one of those genes can change skin color slightly or in some cases, such as for SLC24A5, moderately.
Case 1 â The Alleged Father has Recently Passed Away. If less than a week has passed since the deceased died, then if permission can be obtained, fingernail cuttings and a hair sample with root attached can be used to extract DNA samples to establish paternity. It is a more complex procedure than a buccal swab, but the DNA matching is just as accurate.
It will be extremely difficult to persuade the court to exhume a body for a paternity test. Conduct a DNA test on a sibling or parent of the deceased. A DNA test on a sibling will be able to show that you are a child of the person's relative. Imperfect match DNA samples are almost never admitted in court. You are unlikely to get a court order to do the test if a relative does not consent.