KCET 2020 Biology Solved Paper

The given diagram represents the gel electrophoresis technique. It is used to separate DNA fragments based on their sizes. The DNA fragments that have larger sizes travel a shorter distance than the smaller size DNA fragments from the wells under the influence of an electric field. Hence, 'M' represents the largest DNA bands since it has travelled a less distance from the well when compared to the distance travelled by the fragment 'N'.