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.
Thank you for your letter dated 19 August 2005, requesting information under the Freedom of Information Act. In your letter you asked: -. While a DNA paternity test can disprove paternity, it can never prove paternity. A positive result only gives a very high probability that a man is the father.