Results of maximum-likelihood analysis of the descriptive model

H1 D, RX, and RY varyH2X: RX same; D and RY varyH3X: RX = mD + b; D and RY varyH2Y: RY same; D and RX varyH3Y: RY = mD + b; D and RX vary
No. parameters2719201920
ln –35077.7–35130.6–35098.9–35412.9–35113.2
G vs. H1106 (8 d.f., P < 10–10)42 (7 d.f., P = 5.2 × 10–7)670 (8 d.f., P < 10–10)71 (7 d.f., P < 10–10)
G vs. H263 (1 d.f., P < 10–10)599 (1 d.f., P < 10–10)

Values of ln and G-test comparisons are shown (along with the corresponding probabilities of getting this G value by chance alone). There is highly significant variation of each of the parameters (H2X or H2Y vs. H1) and a highly significant correlation between chromosome-specific sperm recoveries and disjunction (H2X vs. H3X and H2Y vs. H3Y). Although significant variation in sperm survival remains, the correlations with D account for most of the differences in sperm function (H3X or H3Y vs. H1). These results are shown graphically in Figure 3.