Figure 27.  The charcoal test can be used to quickly determine mating type. In this example, the T2 strain has a genotype a2b2 that is compatible with a1b1. The second strain being tested (T1) has a genotype other than a1b1 or a2b2, but further tests would be required to assess its genotype. (Courtesy K.M. Snetselaar) BACK