Figure 1.

Crossing design for the two-male sperm competition experiments to measure influence of inbreeding on relative fertilization success of the first- and second-male-to-mate. Paternity can be assigned for the phenotypic marker male (M) using the Reindeer strain, and therefore sperm competition success for the inbred (I) versus non-inbred (N) experimental males, and P₁ versus P₂; females are non-inbred virgin controls (C) from the GA1 stock (see §2c for details, (a)–(d) correspond with the same denotations in figure 3).