Figure 4.

Sperm phenotypes in domesticus^LEWES Y introgression males. Males with a domesticus^LEWES Y (white) and a complete musculus^PWK X (black) have significantly fewer normal sperm (white bars) and significantly more moderately abnormal (light gray bars) and severely abnormal sperm (dark gray bars) than males with domesticus^LEWES introgressions on the musculus^PWK X, or control males with a musculus^PWK Y; domesticus^LEWES X introgressions eliminate excess sperm abnormality. Bars represent genotypic means; error bars are +1 SE; sample sizes are shown in Figure 1B. Pairwise differences were tested with ANOVA followed by Steel–Dwass post hoc tests. Genotypes not connected by the same letter are significantly different at experiment-wise α = 0.05.