Please help me. I know that Sordaria is a member of the ascomycete fungi, a group often used in genetics experiments. Yet, Sordaria is haploid. How can a haploid organism be used to test genetics problems when such things as crossing over require meiosis as the cell goes from a diploid to a haploid stage? How, then, can we use this haploid organism to test the same genetic problems as with Mendel's peas? Is it possible to use the same statistical procedures used in diploid species such as corn?