Data from: An analytical framework for estimating fertilization bias and the fertilization set from multiple sperm-storage organs

How sperm from competing males are used to fertilize eggs is poorly
understood, yet has important implications for postcopulatory sexual
selection. Sperm may be used in direct proportion to their numerical
representation within the fertilization set or with a bias toward one male
over another. Previous theoretical treatments have assumed a single
sperm-storage organ, but many taxa possess multiple organs or store sperm
within multiple regions of the reproductive tract. In Drosophila, females
store sperm in two distinct storage organ types: the seminal receptacle
(SR) and the paired spermathecae. Here, we expand previous
'raffle' models to describe 'fertilization bias'
independently for sperm within the SR and the spermathecae and estimate
the fertilization set based on the relative contribution of sperm from the
different sperm-storage organ types. We apply this model to three closely
related species to reveal rapid divergence in the fertilization set and
the potential for female sperm choice.