Which of the following descriptions of genetic mapping is incorrect? 1. Cytogenetic mapping is a technique that allows for the creation of detailed physical maps with distances measured in terms of the number of base pairs. 2. Radiation hybrid mapping is a technique that overcomes the limitation of genetic mapping, and is not affected by increased or decreased recombination frequency. 3. Sequence mapping is a technique that allows for the determination of the approximate distance between genetic markers but not the exact distance.