Which type of tissue is most likely to provide an adequate DNA sample for genetic testing?

The most likely tissue type to provide an adequate DNA sample for genetic testing is blood cells. Blood contains a rich source of nucleated cells, particularly white blood cells, which have a nucleus containing DNA. This makes blood an ideal choice for genetic testing, as it provides a higher yield of good-quality DNA compared to other sources.

While nasal epithelial cells can also provide DNA, they may not always yield sufficient quantities or quality for reliable genetic testing. Skin cells can be collected, but they often present challenges such as contamination or degradation, leading to lower quality samples. Hair follicles can contain DNA, but the quality and quantity can vary significantly depending on factors like the phase of the hair growth cycle and the method of collection.

In summary, blood cells are preferred for genetic testing due to their abundance and the quality of DNA they provide. This makes them the most suitable option among the choices provided.