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 is possible to conduct a DNA test without the motherâs consent, but it is not likely to hold up in a court situation. If a child is under 18, the mother is usually required to provide consent in order to go through with the testing. If the child in question is over 18, then the motherâs consent is not required. If the DNA test in question is merely for curiosityâs sake, the test can be physically performed. However, if you are seeking to perform a paternity test for legal reasons, the motherâs consent is almost always required.