The 15-hectare area yielded isolates that had identical mating type alleles and mitochondrial DNA restriction fragment patterns ; this degree of genetic similarity indicated that the samples were all derived from a single genetic individual , or clone , that had reached its size through vegetative growth .
Samples from the 15-hectare area had identical mating type alleles and mitochondrial DNA fragments . This showed the samples were all from a single genetic individual , or clone , which reached its size through vegetative growth .