Fertility data from three generations of hybridisation crosses

Numbers of eggs and offspring from three generations of hybridisation crosses (F1, BC1, BC2).The cross types are labelled based on the species X chromosome identity, C= T . commodus, O = T. oceanicus, while hybrid individuals have a prefix either F1 or BC1 and the species identity of their X chromosomes. The first letter represents the maternal species and the second the paternal species identity. (H) indicates an inter-species recombinant X.