Two empirical rules suggest that sex chromosomes play a special role in speciation. The first
is Haldane's rule–the preferential sterility and inviability of species hybrids of the …

The “dominance theory” of Haldane's rule postulates that hybrids of the heterogametic sex
are more likely to be inviable or sterile than the homogametic sex because some of the …

The collection of Drosophila melanogaster from Zimbabwe and nearby regions (the Z-type)
yield females who would not mate with the cosmopolitan D. melanogaster males (the M …

Postzygotic reproductive isolation is characterized by two striking empirical patterns. The first
is Haldane's rule—the preferential inviability or sterility of species hybrids of the …

In several species of Drosophila, some males carry particular X-linked alleles (referred to as
sex-ratio or SR males) that cause them to sire all-female progeny. In the absence of …

To investigate the time course of speciation, we gathered literature data on 119 pairs of
closely related Drosophila species with known genetic distances, mating discrimination …

Abstract.—Recent studies, primarily in Drosophila, have greatly advanced our
understanding of Haldane's rule, the tendency for hybrid sterility or inviability to affect …

The Sex-ratio chromosome (SR) is a widespread, multiply inverted rearrangement of the X
chromosome present in several species of Drosophila. Male carriers transmit mostly X …

We document the occurrence of" sex ratio" meiotic drive in natural populations of Drosophila
testacea." Sex ratio" males sire greater than 95% female offspring. Genetic analysis reveals …

ABSTRACT The Sex-Ratio (SR) phenomenon is associated with the X chromosome of many
species of Drosophila. Males carrying SR transmit predominantly sperm bearing the X …