(a)The samples are loaded near site A where the wells are present.
(b) The DNA bands take different positions because of the sieving effect produced by the agrose gel. Due to this effect the smaller the size of the DNA the farther it moves.
1. Firstly, DNA strands are strained with Ethidium bromide.
2. Now, these strands are exposed under UV radiations.
3. The DNA strands appear to be colored.
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