Table 1.

Abnormal Spermatid Morphology in wt and Hbs1 mutants.

genotype	total spermatid number	number of different spermatid types
		1:1		1:2		1:4		other irregular	total irregular
		regular	irregular	regular	irregular	regular	irregular
wt	619	613	1	3	0	0	0	2	6
Hbs1 48 /Hbs1 48	404	398	0	2	0	1	0	3	6
Hbs1 1 /Hbs1 1	412	188	27	87	53	24	11	22	224
genomic rescue	578	571	2	5	0	0	0	0	7

Ratios refer to the number of nebenkerns to the number of nuclei. “Regular” means the nuclei are of similar size (Fig. 2C insert). “Irregular” means there are abnormal size of nuclei (Fig. 2B insert). “Other irregular” are irregular spermatids that are not included the former 6 kinds, such as one regular nebenkern with 3 nuclei of different size, abnormal size nebenkerns, and so on. The number of “total irregular” is the sum of all the abnormal spermatids, including the spermatids with the abnormal size nuclei (the “irregular”) and the spermatids with abnormal ratio of nebenkerns to nuclei (1:2, 1:4 and others irregular).