A total of 1551 leaf cells and 4568 calli cells were
surveyed, from these, the interphase cells of normal
appearance were discounted. The remaining cells were
classified as normal mitotic cells, abnormal mitotic cells or
binucleated cells. The cells in the second group were
categorised by mitotic abnormality. A data matrix was
constructed with this information, and tested for goodnessof-
fit using the chi-square test, comparing the proportion of
mitotic aberrations present in the leaves with the proportion
of those found in the calli.