Table 2: Interrupted matings of D. willistoni at different times during copulation between flies from parental populations (P) and mattings involving sterile hybrids (SH). Proportion of females with visible seminal fluid mass inside the bursa (Prop SF) and with sperm within the ejaculate (Prop Sperm) are shown. P-values are from Fisher Exact test comparisons between proportions in parental crosses (P) and crosses with sterile male hybrids (SH).