MATERIALS AND METHODS The reader should consult our previous paper (Coyne and Orr
1989a) for a detailed description of our criteria for including species, determining whether�…

A study was conducted to investigate the factors which affect postmating, genetic exchange
and hybrid sterility among closely related species. Drosophila species were used in the�…

Mathematical models are presented for the evolution of postmating and premating
reproductive isolation. In the case of postmating isolation it is assumed that hybrid sterility or�…

Abstract Theory suggests that multiple mating by females can evolve as a mechanism for
acquiring compatible genes that promote offspring fitness. Genetic compatibility models�…

Hybrid sterility and inviability often result from the accumulation of substitutions that, while
functional on their normal genetic backgrounds, cause a loss of fitness when brought�…

Drosophila yakuba is widespread in Africa, whereas D. santomea, its newly discovered
sister species, is endemic to the volcanic island of S�o Tom� in the Gulf of Guinea�…

The first review of the phenomenon of interspecific hybridization in animals appears to be
that of Haldane (1922), who catalogued all cases known to that time in which crosses�…

Almost 30 years ago, AC Wilson and colleagues presented results indicating that hybrid
inviability between species evolves 10 times faster in mammals than in birds and frogs. Here�…

Variation in reproductive success within and between the sexes was investigated for 2 yr in
bullfrogs, Rana catesbeiana. Number of successful matings per male ranged from zero to�…

Reproductive isolating mechanisms, either premating or postmating, are the key to
speciation; hence, they are among the most important biological properties of species (Mayr�…