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.
The Houston police crime lab has been banned from placing new samples into the FBI's DNA registry because of allegations of shoddy science in local cases; One of the lab's retired metallurgists is challenging the bureau's science on bullet analysis, prompting the FBI to ask the National Academy of Sciences to review its methodology.