Regardless of the shortcomings, DNA profiling is a tricky matter. Because 99.9% of our DNA is the same as everybody else’s DNA, scientists use one-tenth of DNA that is not known to be coded by anything specific to distinguish between individuals. Because of this, there is a lot of variability involved, which helps scientists to determine between individuals. There are two type of forensic evidence that can be used: Autosomal STR or Y-STR. Autosomal STRs are derived from the autosomal chromosome, which is not used in determining the gender of a person. Y-STRs are derived from male sex-determining Y-chromosomes. It is much stronger to use autosomal STR because autosomal DNA is randomly exchanged between matched pairs of sperm and egg cells. This is the primary reason why no two people are alike. In addition to this, Y-STRs are much weaker due to them based on the Y-chromosome, which all males obtain from their fathers. Thus, all males in any paternal line have nearly the same
Regardless of the shortcomings, DNA profiling is a tricky matter. Because 99.9% of our DNA is the same as everybody else’s DNA, scientists use one-tenth of DNA that is not known to be coded by anything specific to distinguish between individuals. Because of this, there is a lot of variability involved, which helps scientists to determine between individuals. There are two type of forensic evidence that can be used: Autosomal STR or Y-STR. Autosomal STRs are derived from the autosomal chromosome, which is not used in determining the gender of a person. Y-STRs are derived from male sex-determining Y-chromosomes. It is much stronger to use autosomal STR because autosomal DNA is randomly exchanged between matched pairs of sperm and egg cells. This is the primary reason why no two people are alike. In addition to this, Y-STRs are much weaker due to them based on the Y-chromosome, which all males obtain from their fathers. Thus, all males in any paternal line have nearly the same