Analyzing Dna Matches From Identical Twins And Other Multiple Births

1500 Words Nov 14th, 2015 6 Pages
Each person’s genome- apart from identical twins’ or other multiple births’- is distinct because of variations in allele frequencies which cause chromosomes to have certain genotypes. This indicates that when the DNA found at a crime location matches a person’s, the individual is the culprit of the crime; however, finalizing a case is not this elementary. The evidence collected from a scene does not show the person’s entire genome. While it can certainly point to suspects whose DNA matches the samples collected from the scene, it does not secure a definite criminal. Analyzing DNA requires understanding of a few complex fundamentals, but probability paired with statistical reasoning provides for a more accurate approach in assessing DNA matches. Humans each have 23 pairs of chromosomes that have similar sequences since they are analogous in gene chronology. They are not identical, though, because one chromosome is composed of alleles of a gene from one parent, and one chromosome is composed of alleles from the other (Dawid and Thomas). Short tandem repeats, or brief recurring patterns, take place at particular positions in all DNA sequences, variation occurring due to the differing number of repeats from person to person (Dawid and Thomas). DNA profiles select certain positions of the human genome and record the number of short tandem repeats that appear there for each DNA sample being analyzed (which in a court case would be the suspect’s profile and the profile from the…
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