| PCR | Gel electrophoresis | 
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					  a specific area of DNA					 
					
					 What is the template in PCR? 
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					  Pieces of DNA of different sizes					 
					
					 What are the bands on the gel? 
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					  primers					 
					
					 What is added to the PCR reaction that determines the portion of DNA amplified in a PCR reaction? 
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					  Multiple alleles, non specific binding					 
					
					 What is the reason for multiple bands when amplifying the same area of DNA? 
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					  Taq polymerase, MgCL2, dNTPS, buffer,					 
					
					 What are the other components of a PCR reaction beside template and primers? (4 items) 
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					  Heterozygote					 
					
					 What is the genotype of someone whose PCR of Alu resulted in 2 DNA bands? 
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					  Denaturation: 94 
					Annealing: 55 to 62 Extension: 72 
					 What are the temperatures at which denaturation, annealing, and extension take place? 
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					  mutation or inheritance of different copies of a gene					 
					
					 What is the cause  of different alleles? 
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					  denaturation: heat separates DNA 
					annealing: primers bind extension: Polymerase adds dNTPS to synthesize a copy of fragment 
					 What are the 3 stages and what occurs during each stage? 
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					  An electrical current is applied to the buffer which generates a positive and negative pole. The DNA is negatively charged and is drown toward the positive pole. 					 
					
					 What causes the DNA to move through the gel in gel electrophoresis? (Be sure to mention negative charge, positive charge, buffer, and electrical current.) 
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