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These genes are cultured in a plate and the gene of interest for it to be determined, the plate with agar+Amp, will not grow. for both those that did pick up and those that didn’t pick up the plasmid grows. The plate with Tetracycline will grow because the plasmid is resistant to TeT, if a bacteria picked up the plasmid, it will also pick up that gene that makes insulin for example. Thus the DNA is purified using gel electrophoresis (Fig 1), which means running in an electric field. The molecules move from the b negative electrode to the positive electrode, the molecules are separated based on their molecular weight as the smallest particles move faster. DNA fragments must be separated from each other to determine the pattern of cuts. For DNA mapping, more than one restriction enzymes will be used and the distance a band travels in a gel for different enzymes is used to construct a map.įig 1: Image showing purification of DNA using Gel ElectrophoresisĮxperimental data is given below which shows the number of base pair per band, we have EcoR1 and HindIII, both enzymes are super imposed together i.e. My plasmid is 50B.P long, so I drew a circle which shows 50 the did the same for others, all summing up to 50, which shows the original piece of DNA.ĭouble digest, so we want to find where these enzymes cut a plasmid. I start with the enzyme which cuts the plasmid the most i.e. EcoR1 then on the map, I start at the 12 o’clock and measure 30, 15, 5. To find where HindIII cuts the map, I looked at the double digest and found which B.P are repeated i.e. 15 & 5, therefore the area is highlighted below. Look to the other side and mark 20 & 10 the cut is shown in red meaning that is where HindIII cuts the plasmid. Thus you have a plasmid map.įig 2: Circular restriction map at 12 o’clock which relies on restriction enzymes that cut specific DNA molecules at a restriction site. I studied Biochemistry at the University of Lagos, Nigeria. As my first degree as a graduate, I plan to advance my career in the near future in the Biotechnology field. I love creativity and learning new things, and want to be a part of an evolution in life sciences. #Snapgene viewer restriction enzyme digest license key
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