CRIM 355 Chapter Notes - Chapter 10: Forensic Science, Genetic Testing, Cell Nucleus
10 Mar 2020
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Dna - molecules carrying body"s genetic info. Double stranded in shape of double helix. Discovery caught imagination of forensic science community b/c forensic scientists have long desired to link w/ certainty biological evidence such as blood, semen, hair, tissue w/ single indiv. Dna typing has allowed forensic scientists to individualize. Chromosome - rod-like structure in cell nucleus, along which genes located. Composed of dna surrounded by other material, mainly proteins. Instructs body cells to make proteins that determine everything from hair colour to susceptibility to diseases. Major breakthrough in comprehending how dna works - did not occur until early 1950s. Polymer - substance composed of large number of atoms. Atoms usually arranged in repeating units, or monomers. Nucleotide - unit of dna consisting of one of four bases attached to phosphate-sugar group. In theory, no limit to length of dna strand. Complementary base pairing - specific pairing of base a with t & base g with c in double-stranded dna.
