In the past decade, advances in genome sequencing have allowed researchers to uncover
the history of hybridization in diverse groups of species, including our own. Although the …

Intrinsic postzygotic barriers can play an important and multifaceted role in speciation, but
their contribution is often thought to be reserved to the final stages of the speciation process …

Sexual reproduction is a fundamental aspect of life. It is defined by the occurrence of meiosis
and the fusion of two gametes of different sexes or mating types. Sex-determination …

Incompatibilities in interspecific hybrids, such as sterility and lethality, are widely observed
causes of reproductive isolation and thus contribute to speciation. Because hybrid …

Speciation genes restrict gene flow between the incipient species and related taxa. Three
decades ago, we mapped a mammalian speciation gene, hybrid sterility 1 (Hst1), in the …

Recently diverged taxa may continue to exchange genes. A number of models of speciation
with gene flow propose that the frequency of gene exchange will be lower in genomic …

Hybrid zones provide a powerful opportunity to analyze ecological and evolutionary
interactions between divergent lineages. As such, research on hybrid zones has played a …

The onset of prezygotic and postzygotic barriers to gene flow between populations is a
hallmark of speciation. One of the earliest postzygotic isolating barriers to arise between …

Speciation research has largely assumed that the genetic causes of reproductive isolation
are the work of fixed, divergent alleles that interact to cause genetic problems in hybrids …

Hybrids between species provide information about the evolutionary processes involved in
divergence. In addition to creating hybrids in the laboratory, biologists can take advantage of …