Discussion 02-18

Discussion 02-18 - Forensic DNA Analysis- A background for...

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Unformatted text preview: Forensic DNA Analysis- A background for future presentations Brittany Huntington February 18, 2009 ETX 20: Intro to Forensic Science DNA-structure Deoxyribonucleic Acid (DNA) Purpose of DNA To make copies of itself so cells can divide and carry on the same information To carry instruction on how to make proteins so the cells can build the machinery of life Found in all known living organisms and some viruses Main role is long term storage Genes are segments that carry genetic information Double helix Phosphate-sugar backbone and one of four bases attach to the sugar Bases A- Adenine T- Thymine G- Guanine C- Cytosine DNA- packaging Nuclear DNA is packaged in chromosomes Humans have 22 matched pairs of autosomal chromosomes and 2 sex determining chromosomes 23 pairs of chromosomes in a normal cell, or 46 strands of DNA All body (somatic) cells are DIPLOID (2 sets of each chromosome) Gametes (sperm and egg) are HAPLOID (they contain 1 set of each chromosome) Where Is the DNA in the cell Nuclear DNA Found in the nucleus Chromosomes are packaged within the nucleus Inherited half the genetic make up from mom and the other half from dad, making it unique to each individual Where Is the DNA in the cell Mitochondrial DNA (mtDNA) Found in the mitochondria Energy power houses of the cell Maternally inherited Mitochondria from the sperm will not typically enter the egg during fertilization No change from parent to offspring Basics of DNA Nucleotides Molecules which comprise the structural units of DNA A nucleotide consists of a phosphate, pentose sugar, and a heterocyclic amine (your base) Base Pairing...
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This note was uploaded on 07/22/2009 for the course ETX 001 taught by Professor Matthewwood during the Winter '09 term at UC Davis.

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Discussion 02-18 - Forensic DNA Analysis- A background for...

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