DNA analysis, which has proven to be a major advance in the field of paternity testing, involves the direct examination of the genetic material that a child inherited from its biological parents. DNA is located throughout the human body and in the same identical form.
In a plant with a taproot system, the taproot is the largest, most central, and most dominant root from which other roots sprout laterally. Typically a taproot is somewhat straight and very thick, is tapering in shape, and grows directly downward.
A tap root is a specific type of root structure present on some plants, which is typified by being rather large, and going directly down into the ground. This structure has other roots growing off of it as it descends, acting as a sort of trunk beneath the ground.