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.
About avuncular testing. Aunt or uncle DNA testing is an alternative to paternity testing for when the alleged father of a child is unavailable for the test. Comparing the DNA of the child to that of their aunts or uncles can help confirm whether they are blood relatives. If the child is unrelated to their uncles and aunts, it indicates that the childâs father is also not the childâs biological father.